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Finding the Fourth Proportional to 77.48, 106.88 and 55.61

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Solution

The fourth proportional to 77.48, 106.88 and 55.61 is: 76.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    77.48 : 106.88 = 55.61 : x
  2. Step 2: Convert to fraction form
    77.48/106.88 = 55.61/x
  3. Step 3: Cross multiply
    77.48x = 106.88 × 55.61
  4. Step 4: Simplify right side
    77.48x = 5,943.60
  5. Step 5: Solve for x
    x = 5,943.60/77.48
  6. Step 6: Final answer
    x = 76.71

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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.