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Finding the Fourth Proportional to 83,912.64, 126,368.88 and 75,687.36

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Solution

The fourth proportional to 83,912.64, 126,368.88 and 75,687.36 is: 113,981.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    83,912.64 : 126,368.88 = 75,687.36 : x
  2. Step 2: Convert to fraction form
    83,912.64/126,368.88 = 75,687.36/x
  3. Step 3: Cross multiply
    83,912.64x = 126,368.88 × 75,687.36
  4. Step 4: Simplify right side
    83,912.64x = 9,564,526,913.36
  5. Step 5: Solve for x
    x = 9,564,526,913.36/83,912.64
  6. Step 6: Final answer
    x = 113,981.96

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.