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Finding the Fourth Proportional to 77.52, 107.08 and 73.92

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Solution

The fourth proportional to 77.52, 107.08 and 73.92 is: 102.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    77.52 : 107.08 = 73.92 : x
  2. Step 2: Convert to fraction form
    77.52/107.08 = 73.92/x
  3. Step 3: Cross multiply
    77.52x = 107.08 × 73.92
  4. Step 4: Simplify right side
    77.52x = 7,915.35
  5. Step 5: Solve for x
    x = 7,915.35/77.52
  6. Step 6: Final answer
    x = 102.11

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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.