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Finding the Fourth Proportional to 717,806.17, 990,616.76 and 395,516.22

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Solution

The fourth proportional to 717,806.17, 990,616.76 and 395,516.22 is: 545,836.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    717,806.17 : 990,616.76 = 395,516.22 : x
  2. Step 2: Convert to fraction form
    717,806.17/990,616.76 = 395,516.22/x
  3. Step 3: Cross multiply
    717,806.17x = 990,616.76 × 395,516.22
  4. Step 4: Simplify right side
    717,806.17x = 391,804,996,383.85
  5. Step 5: Solve for x
    x = 391,804,996,383.85/717,806.17
  6. Step 6: Final answer
    x = 545,836.76

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.