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Finding the Fourth Proportional to 135.69, 187.13 and 83.85

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Solution

The fourth proportional to 135.69, 187.13 and 83.85 is: 115.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    135.69 : 187.13 = 83.85 : x
  2. Step 2: Convert to fraction form
    135.69/187.13 = 83.85/x
  3. Step 3: Cross multiply
    135.69x = 187.13 × 83.85
  4. Step 4: Simplify right side
    135.69x = 15,690.85
  5. Step 5: Solve for x
    x = 15,690.85/135.69
  6. Step 6: Final answer
    x = 115.64

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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.