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Finding the Fourth Proportional to 717,676, 990,392.88 and 399,724

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Solution

The fourth proportional to 717,676, 990,392.88 and 399,724 is: 551,619.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    717,676 : 990,392.88 = 399,724 : x
  2. Step 2: Convert to fraction form
    717,676/990,392.88 = 399,724/x
  3. Step 3: Cross multiply
    717,676x = 990,392.88 × 399,724
  4. Step 4: Simplify right side
    717,676x = 395,883,803,565.12
  5. Step 5: Solve for x
    x = 395,883,803,565.12/717,676
  6. Step 6: Final answer
    x = 551,619.12

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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.