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Finding the Fourth Proportional to 135.52, 186.98 and 86.40

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Solution

The fourth proportional to 135.52, 186.98 and 86.40 is: 119.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    135.52 : 186.98 = 86.40 : x
  2. Step 2: Convert to fraction form
    135.52/186.98 = 86.40/x
  3. Step 3: Cross multiply
    135.52x = 186.98 × 86.40
  4. Step 4: Simplify right side
    135.52x = 16,155.07
  5. Step 5: Solve for x
    x = 16,155.07/135.52
  6. Step 6: Final answer
    x = 119.21

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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.