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Finding the Fourth Proportional to 91.15, 136.49 and 76.67

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Solution

The fourth proportional to 91.15, 136.49 and 76.67 is: 114.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.15 : 136.49 = 76.67 : x
  2. Step 2: Convert to fraction form
    91.15/136.49 = 76.67/x
  3. Step 3: Cross multiply
    91.15x = 136.49 × 76.67
  4. Step 4: Simplify right side
    91.15x = 10,465.17
  5. Step 5: Solve for x
    x = 10,465.17/91.15
  6. Step 6: Final answer
    x = 114.81

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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.