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Finding the Fourth Proportional to 83.28, 114.86 and 53.78

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Solution

The fourth proportional to 83.28, 114.86 and 53.78 is: 74.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    83.28 : 114.86 = 53.78 : x
  2. Step 2: Convert to fraction form
    83.28/114.86 = 53.78/x
  3. Step 3: Cross multiply
    83.28x = 114.86 × 53.78
  4. Step 4: Simplify right side
    83.28x = 6,177.17
  5. Step 5: Solve for x
    x = 6,177.17/83.28
  6. Step 6: Final answer
    x = 74.17

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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.