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Finding the Fourth Proportional to 135.74, 187.30 and 76.72

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Solution

The fourth proportional to 135.74, 187.30 and 76.72 is: 105.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    135.74 : 187.30 = 76.72 : x
  2. Step 2: Convert to fraction form
    135.74/187.30 = 76.72/x
  3. Step 3: Cross multiply
    135.74x = 187.30 × 76.72
  4. Step 4: Simplify right side
    135.74x = 14,369.66
  5. Step 5: Solve for x
    x = 14,369.66/135.74
  6. Step 6: Final answer
    x = 105.86

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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.