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Finding the Fourth Proportional to 92.96, 138.41 and 91.65

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Solution

The fourth proportional to 92.96, 138.41 and 91.65 is: 136.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.96 : 138.41 = 91.65 : x
  2. Step 2: Convert to fraction form
    92.96/138.41 = 91.65/x
  3. Step 3: Cross multiply
    92.96x = 138.41 × 91.65
  4. Step 4: Simplify right side
    92.96x = 12,684.82
  5. Step 5: Solve for x
    x = 12,684.82/92.96
  6. Step 6: Final answer
    x = 136.46

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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.