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Finding the Fourth Proportional to 92.46, 139.36 and 91.64

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Solution

The fourth proportional to 92.46, 139.36 and 91.64 is: 138.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.46 : 139.36 = 91.64 : x
  2. Step 2: Convert to fraction form
    92.46/139.36 = 91.64/x
  3. Step 3: Cross multiply
    92.46x = 139.36 × 91.64
  4. Step 4: Simplify right side
    92.46x = 12,770.95
  5. Step 5: Solve for x
    x = 12,770.95/92.46
  6. Step 6: Final answer
    x = 138.12

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.