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Finding the Fourth Proportional to 128,834.64, 193,154.52 and 84,472.56

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Solution

The fourth proportional to 128,834.64, 193,154.52 and 84,472.56 is: 126,644.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,834.64 : 193,154.52 = 84,472.56 : x
  2. Step 2: Convert to fraction form
    128,834.64/193,154.52 = 84,472.56/x
  3. Step 3: Cross multiply
    128,834.64x = 193,154.52 × 84,472.56
  4. Step 4: Simplify right side
    128,834.64x = 16,316,256,779.97
  5. Step 5: Solve for x
    x = 16,316,256,779.97/128,834.64
  6. Step 6: Final answer
    x = 126,644.95

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.