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Finding the Fourth Proportional to 657,987.92, 907,989 and 386,018

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Solution

The fourth proportional to 657,987.92, 907,989 and 386,018 is: 532,684.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    657,987.92 : 907,989 = 386,018 : x
  2. Step 2: Convert to fraction form
    657,987.92/907,989 = 386,018/x
  3. Step 3: Cross multiply
    657,987.92x = 907,989 × 386,018
  4. Step 4: Simplify right side
    657,987.92x = 350,500,097,802
  5. Step 5: Solve for x
    x = 350,500,097,802/657,987.92
  6. Step 6: Final answer
    x = 532,684.70

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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.