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Finding the Fourth Proportional to 91.96, 126.90 and 55.15

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Solution

The fourth proportional to 91.96, 126.90 and 55.15 is: 76.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.96 : 126.90 = 55.15 : x
  2. Step 2: Convert to fraction form
    91.96/126.90 = 55.15/x
  3. Step 3: Cross multiply
    91.96x = 126.90 × 55.15
  4. Step 4: Simplify right side
    91.96x = 6,998.22
  5. Step 5: Solve for x
    x = 6,998.22/91.96
  6. Step 6: Final answer
    x = 76.10

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.