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Finding the Fourth Proportional to 91.22, 136.73 and 66.45

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Solution

The fourth proportional to 91.22, 136.73 and 66.45 is: 99.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.22 : 136.73 = 66.45 : x
  2. Step 2: Convert to fraction form
    91.22/136.73 = 66.45/x
  3. Step 3: Cross multiply
    91.22x = 136.73 × 66.45
  4. Step 4: Simplify right side
    91.22x = 9,085.20
  5. Step 5: Solve for x
    x = 9,085.20/91.22
  6. Step 6: Final answer
    x = 99.60

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.