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Finding the Fourth Proportional to 92.29, 138.45 and 85.42

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Solution

The fourth proportional to 92.29, 138.45 and 85.42 is: 128.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.29 : 138.45 = 85.42 : x
  2. Step 2: Convert to fraction form
    92.29/138.45 = 85.42/x
  3. Step 3: Cross multiply
    92.29x = 138.45 × 85.42
  4. Step 4: Simplify right side
    92.29x = 11,826.40
  5. Step 5: Solve for x
    x = 11,826.40/92.29
  6. Step 6: Final answer
    x = 128.14

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.