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Finding the Fourth Proportional to 128,476.62, 177,292.80 and 71,888.04

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Solution

The fourth proportional to 128,476.62, 177,292.80 and 71,888.04 is: 99,202.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,476.62 : 177,292.80 = 71,888.04 : x
  2. Step 2: Convert to fraction form
    128,476.62/177,292.80 = 71,888.04/x
  3. Step 3: Cross multiply
    128,476.62x = 177,292.80 × 71,888.04
  4. Step 4: Simplify right side
    128,476.62x = 12,745,231,898.11
  5. Step 5: Solve for x
    x = 12,745,231,898.11/128,476.62
  6. Step 6: Final answer
    x = 99,202.73

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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.