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Finding the Fourth Proportional to 687,921.32, 949,279.38 and 386,057

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Solution

The fourth proportional to 687,921.32, 949,279.38 and 386,057 is: 532,729.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    687,921.32 : 949,279.38 = 386,057 : x
  2. Step 2: Convert to fraction form
    687,921.32/949,279.38 = 386,057/x
  3. Step 3: Cross multiply
    687,921.32x = 949,279.38 × 386,057
  4. Step 4: Simplify right side
    687,921.32x = 366,475,949,604.66
  5. Step 5: Solve for x
    x = 366,475,949,604.66/687,921.32
  6. Step 6: Final answer
    x = 532,729.45

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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.