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Finding the Fourth Proportional to 717,334, 989,920.92 and 399,382

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Solution

The fourth proportional to 717,334, 989,920.92 and 399,382 is: 551,147.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    717,334 : 989,920.92 = 399,382 : x
  2. Step 2: Convert to fraction form
    717,334/989,920.92 = 399,382/x
  3. Step 3: Cross multiply
    717,334x = 989,920.92 × 399,382
  4. Step 4: Simplify right side
    717,334x = 395,356,596,871.44
  5. Step 5: Solve for x
    x = 395,356,596,871.44/717,334
  6. Step 6: Final answer
    x = 551,147.16

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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.