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Finding the Fourth Proportional to 136.50, 188.41 and 84.74

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Solution

The fourth proportional to 136.50, 188.41 and 84.74 is: 116.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    136.50 : 188.41 = 84.74 : x
  2. Step 2: Convert to fraction form
    136.50/188.41 = 84.74/x
  3. Step 3: Cross multiply
    136.50x = 188.41 × 84.74
  4. Step 4: Simplify right side
    136.50x = 15,965.86
  5. Step 5: Solve for x
    x = 15,965.86/136.50
  6. Step 6: Final answer
    x = 116.97

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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.