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Finding the Fourth Proportional to 135.28, 187.14 and 123.76

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Solution

The fourth proportional to 135.28, 187.14 and 123.76 is: 171.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    135.28 : 187.14 = 123.76 : x
  2. Step 2: Convert to fraction form
    135.28/187.14 = 123.76/x
  3. Step 3: Cross multiply
    135.28x = 187.14 × 123.76
  4. Step 4: Simplify right side
    135.28x = 23,160.45
  5. Step 5: Solve for x
    x = 23,160.45/135.28
  6. Step 6: Final answer
    x = 171.20

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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.