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Finding the Fourth Proportional to 219,753.92, 303,309.92 and 129,139

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Solution

The fourth proportional to 219,753.92, 303,309.92 and 129,139 is: 178,240.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    219,753.92 : 303,309.92 = 129,139 : x
  2. Step 2: Convert to fraction form
    219,753.92/303,309.92 = 129,139/x
  3. Step 3: Cross multiply
    219,753.92x = 303,309.92 × 129,139
  4. Step 4: Simplify right side
    219,753.92x = 39,169,139,758.88
  5. Step 5: Solve for x
    x = 39,169,139,758.88/219,753.92
  6. Step 6: Final answer
    x = 178,240.91

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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.