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Finding the Fourth Proportional to 390,876.95, 539,423.39 and 229,729.70

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Solution

The fourth proportional to 390,876.95, 539,423.39 and 229,729.70 is: 317,034.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,876.95 : 539,423.39 = 229,729.70 : x
  2. Step 2: Convert to fraction form
    390,876.95/539,423.39 = 229,729.70/x
  3. Step 3: Cross multiply
    390,876.95x = 539,423.39 × 229,729.70
  4. Step 4: Simplify right side
    390,876.95x = 123,921,573,557.68
  5. Step 5: Solve for x
    x = 123,921,573,557.68/390,876.95
  6. Step 6: Final answer
    x = 317,034.74

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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.