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Finding the Fourth Proportional to 135.25, 186.61 and 76.24

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Solution

The fourth proportional to 135.25, 186.61 and 76.24 is: 105.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    135.25 : 186.61 = 76.24 : x
  2. Step 2: Convert to fraction form
    135.25/186.61 = 76.24/x
  3. Step 3: Cross multiply
    135.25x = 186.61 × 76.24
  4. Step 4: Simplify right side
    135.25x = 14,226.81
  5. Step 5: Solve for x
    x = 14,226.81/135.25
  6. Step 6: Final answer
    x = 105.19

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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.