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Finding the Fourth Proportional to 91.68, 136.60 and 90.24

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Solution

The fourth proportional to 91.68, 136.60 and 90.24 is: 134.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.68 : 136.60 = 90.24 : x
  2. Step 2: Convert to fraction form
    91.68/136.60 = 90.24/x
  3. Step 3: Cross multiply
    91.68x = 136.60 × 90.24
  4. Step 4: Simplify right side
    91.68x = 12,326.78
  5. Step 5: Solve for x
    x = 12,326.78/91.68
  6. Step 6: Final answer
    x = 134.45

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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.