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Finding the Fourth Proportional to 91.36, 135.89 and 89.08

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Solution

The fourth proportional to 91.36, 135.89 and 89.08 is: 132.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.36 : 135.89 = 89.08 : x
  2. Step 2: Convert to fraction form
    91.36/135.89 = 89.08/x
  3. Step 3: Cross multiply
    91.36x = 135.89 × 89.08
  4. Step 4: Simplify right side
    91.36x = 12,105.08
  5. Step 5: Solve for x
    x = 12,105.08/91.36
  6. Step 6: Final answer
    x = 132.50

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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.