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Finding the Fourth Proportional to 148,459.52, 204,876.80 and 81,390.72

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Solution

The fourth proportional to 148,459.52, 204,876.80 and 81,390.72 is: 112,320.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    148,459.52 : 204,876.80 = 81,390.72 : x
  2. Step 2: Convert to fraction form
    148,459.52/204,876.80 = 81,390.72/x
  3. Step 3: Cross multiply
    148,459.52x = 204,876.80 × 81,390.72
  4. Step 4: Simplify right side
    148,459.52x = 16,675,070,263.30
  5. Step 5: Solve for x
    x = 16,675,070,263.30/148,459.52
  6. Step 6: Final answer
    x = 112,320.65

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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.