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Finding the Fourth Proportional to 717,685.86, 990,407.42 and 390,997.26

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Solution

The fourth proportional to 717,685.86, 990,407.42 and 390,997.26 is: 539,576.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    717,685.86 : 990,407.42 = 390,997.26 : x
  2. Step 2: Convert to fraction form
    717,685.86/990,407.42 = 390,997.26/x
  3. Step 3: Cross multiply
    717,685.86x = 990,407.42 × 390,997.26
  4. Step 4: Simplify right side
    717,685.86x = 387,246,585,548.68
  5. Step 5: Solve for x
    x = 387,246,585,548.68/717,685.86
  6. Step 6: Final answer
    x = 539,576.72

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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.