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Finding the Fourth Proportional to 135.66, 187.24 and 77.47

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Solution

The fourth proportional to 135.66, 187.24 and 77.47 is: 106.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    135.66 : 187.24 = 77.47 : x
  2. Step 2: Convert to fraction form
    135.66/187.24 = 77.47/x
  3. Step 3: Cross multiply
    135.66x = 187.24 × 77.47
  4. Step 4: Simplify right side
    135.66x = 14,505.81
  5. Step 5: Solve for x
    x = 14,505.81/135.66
  6. Step 6: Final answer
    x = 106.93

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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.