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Finding the Fourth Proportional to 136, 187.62 and 86.80

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Solution

The fourth proportional to 136, 187.62 and 86.80 is: 119.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    136 : 187.62 = 86.80 : x
  2. Step 2: Convert to fraction form
    136/187.62 = 86.80/x
  3. Step 3: Cross multiply
    136x = 187.62 × 86.80
  4. Step 4: Simplify right side
    136x = 16,285.42
  5. Step 5: Solve for x
    x = 16,285.42/136
  6. Step 6: Final answer
    x = 119.75

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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.