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Finding the Fourth Proportional to 135.49, 186.87 and 86.40

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Solution

The fourth proportional to 135.49, 186.87 and 86.40 is: 119.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    135.49 : 186.87 = 86.40 : x
  2. Step 2: Convert to fraction form
    135.49/186.87 = 86.40/x
  3. Step 3: Cross multiply
    135.49x = 186.87 × 86.40
  4. Step 4: Simplify right side
    135.49x = 16,145.57
  5. Step 5: Solve for x
    x = 16,145.57/135.49
  6. Step 6: Final answer
    x = 119.16

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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.