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Finding the Fourth Proportional to 390,332.87, 538,808 and 254,399.88

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Solution

The fourth proportional to 390,332.87, 538,808 and 254,399.88 is: 351,168.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,332.87 : 538,808 = 254,399.88 : x
  2. Step 2: Convert to fraction form
    390,332.87/538,808 = 254,399.88/x
  3. Step 3: Cross multiply
    390,332.87x = 538,808 × 254,399.88
  4. Step 4: Simplify right side
    390,332.87x = 137,072,690,543.04
  5. Step 5: Solve for x
    x = 137,072,690,543.04/390,332.87
  6. Step 6: Final answer
    x = 351,168.71

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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.