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Finding the Fourth Proportional to 92.48, 138.74 and 91.30

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Solution

The fourth proportional to 92.48, 138.74 and 91.30 is: 136.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.48 : 138.74 = 91.30 : x
  2. Step 2: Convert to fraction form
    92.48/138.74 = 91.30/x
  3. Step 3: Cross multiply
    92.48x = 138.74 × 91.30
  4. Step 4: Simplify right side
    92.48x = 12,666.96
  5. Step 5: Solve for x
    x = 12,666.96/92.48
  6. Step 6: Final answer
    x = 136.97

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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.