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Finding the Fourth Proportional to 717,487.74, 990,132.96 and 395,197.82

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Solution

The fourth proportional to 717,487.74, 990,132.96 and 395,197.82 is: 545,372.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    717,487.74 : 990,132.96 = 395,197.82 : x
  2. Step 2: Convert to fraction form
    717,487.74/990,132.96 = 395,197.82/x
  3. Step 3: Cross multiply
    717,487.74x = 990,132.96 × 395,197.82
  4. Step 4: Simplify right side
    717,487.74x = 391,298,387,302.15
  5. Step 5: Solve for x
    x = 391,298,387,302.15/717,487.74
  6. Step 6: Final answer
    x = 545,372.93

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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.