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Finding the Fourth Proportional to 717,636.32, 990,350.78 and 395,344.20

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Solution

The fourth proportional to 717,636.32, 990,350.78 and 395,344.20 is: 545,581.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    717,636.32 : 990,350.78 = 395,344.20 : x
  2. Step 2: Convert to fraction form
    717,636.32/990,350.78 = 395,344.20/x
  3. Step 3: Cross multiply
    717,636.32x = 990,350.78 × 395,344.20
  4. Step 4: Simplify right side
    717,636.32x = 391,529,436,838.48
  5. Step 5: Solve for x
    x = 391,529,436,838.48/717,636.32
  6. Step 6: Final answer
    x = 545,581.97

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Double scale
Find fourth proportional to 717,637.32, 990,352.16 and 395,345.20
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.