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Finding the Fourth Proportional to 91.04, 136.20 and 60.64

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Solution

The fourth proportional to 91.04, 136.20 and 60.64 is: 90.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.04 : 136.20 = 60.64 : x
  2. Step 2: Convert to fraction form
    91.04/136.20 = 60.64/x
  3. Step 3: Cross multiply
    91.04x = 136.20 × 60.64
  4. Step 4: Simplify right side
    91.04x = 8,259.17
  5. Step 5: Solve for x
    x = 8,259.17/91.04
  6. Step 6: Final answer
    x = 90.72

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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.