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Finding the Fourth Proportional to 91.36, 126.06 and 66.76

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Solution

The fourth proportional to 91.36, 126.06 and 66.76 is: 92.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.36 : 126.06 = 66.76 : x
  2. Step 2: Convert to fraction form
    91.36/126.06 = 66.76/x
  3. Step 3: Cross multiply
    91.36x = 126.06 × 66.76
  4. Step 4: Simplify right side
    91.36x = 8,415.77
  5. Step 5: Solve for x
    x = 8,415.77/91.36
  6. Step 6: Final answer
    x = 92.12

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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.