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Finding the Fourth Proportional to 77.60, 106.92 and 55.72

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Solution

The fourth proportional to 77.60, 106.92 and 55.72 is: 76.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    77.60 : 106.92 = 55.72 : x
  2. Step 2: Convert to fraction form
    77.60/106.92 = 55.72/x
  3. Step 3: Cross multiply
    77.60x = 106.92 × 55.72
  4. Step 4: Simplify right side
    77.60x = 5,957.58
  5. Step 5: Solve for x
    x = 5,957.58/77.60
  6. Step 6: Final answer
    x = 76.77

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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.