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Finding the Fourth Proportional to 91.36, 126.61 and 89.74

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Solution

The fourth proportional to 91.36, 126.61 and 89.74 is: 124.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.36 : 126.61 = 89.74 : x
  2. Step 2: Convert to fraction form
    91.36/126.61 = 89.74/x
  3. Step 3: Cross multiply
    91.36x = 126.61 × 89.74
  4. Step 4: Simplify right side
    91.36x = 11,361.98
  5. Step 5: Solve for x
    x = 11,361.98/91.36
  6. Step 6: Final answer
    x = 124.36

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.