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Finding the Fourth Proportional to 91.17, 136.77 and 74.07

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Solution

The fourth proportional to 91.17, 136.77 and 74.07 is: 111.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.17 : 136.77 = 74.07 : x
  2. Step 2: Convert to fraction form
    91.17/136.77 = 74.07/x
  3. Step 3: Cross multiply
    91.17x = 136.77 × 74.07
  4. Step 4: Simplify right side
    91.17x = 10,130.55
  5. Step 5: Solve for x
    x = 10,130.55/91.17
  6. Step 6: Final answer
    x = 111.12

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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.