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Finding the Fourth Proportional to 128,891.91, 193,337.53 and 72,706.52

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Solution

The fourth proportional to 128,891.91, 193,337.53 and 72,706.52 is: 109,059.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,891.91 : 193,337.53 = 72,706.52 : x
  2. Step 2: Convert to fraction form
    128,891.91/193,337.53 = 72,706.52/x
  3. Step 3: Cross multiply
    128,891.91x = 193,337.53 × 72,706.52
  4. Step 4: Simplify right side
    128,891.91x = 14,056,898,991.70
  5. Step 5: Solve for x
    x = 14,056,898,991.70/128,891.91
  6. Step 6: Final answer
    x = 109,059.59

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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.