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Finding the Fourth Proportional to 257,553.80, 386,330.70 and 238,891.40

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Solution

The fourth proportional to 257,553.80, 386,330.70 and 238,891.40 is: 358,337.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    257,553.80 : 386,330.70 = 238,891.40 : x
  2. Step 2: Convert to fraction form
    257,553.80/386,330.70 = 238,891.40/x
  3. Step 3: Cross multiply
    257,553.80x = 386,330.70 × 238,891.40
  4. Step 4: Simplify right side
    257,553.80x = 92,291,081,785.98
  5. Step 5: Solve for x
    x = 92,291,081,785.98/257,553.80
  6. Step 6: Final answer
    x = 358,337.10

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.