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Finding the Fourth Proportional to 717,509.36, 990,126.34 and 395,212.52

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Solution

The fourth proportional to 717,509.36, 990,126.34 and 395,212.52 is: 545,373.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    717,509.36 : 990,126.34 = 395,212.52 : x
  2. Step 2: Convert to fraction form
    717,509.36/990,126.34 = 395,212.52/x
  3. Step 3: Cross multiply
    717,509.36x = 990,126.34 × 395,212.52
  4. Step 4: Simplify right side
    717,509.36x = 391,310,325,949.78
  5. Step 5: Solve for x
    x = 391,310,325,949.78/717,509.36
  6. Step 6: Final answer
    x = 545,373.13

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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.