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Finding the Fourth Proportional to 128,891.52, 177,870.87 and 72,299.25

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Solution

The fourth proportional to 128,891.52, 177,870.87 and 72,299.25 is: 99,773.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,891.52 : 177,870.87 = 72,299.25 : x
  2. Step 2: Convert to fraction form
    128,891.52/177,870.87 = 72,299.25/x
  3. Step 3: Cross multiply
    128,891.52x = 177,870.87 × 72,299.25
  4. Step 4: Simplify right side
    128,891.52x = 12,859,930,497.85
  5. Step 5: Solve for x
    x = 12,859,930,497.85/128,891.52
  6. Step 6: Final answer
    x = 99,773.29

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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.