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Finding the Fourth Proportional to 136.18, 187.90 and 87

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Solution

The fourth proportional to 136.18, 187.90 and 87 is: 120.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    136.18 : 187.90 = 87 : x
  2. Step 2: Convert to fraction form
    136.18/187.90 = 87/x
  3. Step 3: Cross multiply
    136.18x = 187.90 × 87
  4. Step 4: Simplify right side
    136.18x = 16,347.30
  5. Step 5: Solve for x
    x = 16,347.30/136.18
  6. Step 6: Final answer
    x = 120.04

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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.