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Finding the Fourth Proportional to 390,761.52, 539,279.87 and 218,696.73

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Solution

The fourth proportional to 390,761.52, 539,279.87 and 218,696.73 is: 301,817.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,761.52 : 539,279.87 = 218,696.73 : x
  2. Step 2: Convert to fraction form
    390,761.52/539,279.87 = 218,696.73/x
  3. Step 3: Cross multiply
    390,761.52x = 539,279.87 × 218,696.73
  4. Step 4: Simplify right side
    390,761.52x = 117,938,744,123.83
  5. Step 5: Solve for x
    x = 117,938,744,123.83/390,761.52
  6. Step 6: Final answer
    x = 301,817.70

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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.