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Finding the Fourth Proportional to 717,672, 990,387.36 and 399,720

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Solution

The fourth proportional to 717,672, 990,387.36 and 399,720 is: 551,613.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    717,672 : 990,387.36 = 399,720 : x
  2. Step 2: Convert to fraction form
    717,672/990,387.36 = 399,720/x
  3. Step 3: Cross multiply
    717,672x = 990,387.36 × 399,720
  4. Step 4: Simplify right side
    717,672x = 395,877,635,539.20
  5. Step 5: Solve for x
    x = 395,877,635,539.20/717,672
  6. Step 6: Final answer
    x = 551,613.60

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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.