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Finding the Fourth Proportional to 92.48, 138.05 and 86

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Solution

The fourth proportional to 92.48, 138.05 and 86 is: 128.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.48 : 138.05 = 86 : x
  2. Step 2: Convert to fraction form
    92.48/138.05 = 86/x
  3. Step 3: Cross multiply
    92.48x = 138.05 × 86
  4. Step 4: Simplify right side
    92.48x = 11,872.30
  5. Step 5: Solve for x
    x = 11,872.30/92.48
  6. Step 6: Final answer
    x = 128.38

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.