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Finding the Fourth Proportional to 86.53, 119.34 and 66.86

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Solution

The fourth proportional to 86.53, 119.34 and 66.86 is: 92.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    86.53 : 119.34 = 66.86 : x
  2. Step 2: Convert to fraction form
    86.53/119.34 = 66.86/x
  3. Step 3: Cross multiply
    86.53x = 119.34 × 66.86
  4. Step 4: Simplify right side
    86.53x = 7,978.74
  5. Step 5: Solve for x
    x = 7,978.74/86.53
  6. Step 6: Final answer
    x = 92.21

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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.