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Finding the Fourth Proportional to 89.16, 133.15 and 76.19

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Solution

The fourth proportional to 89.16, 133.15 and 76.19 is: 113.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.16 : 133.15 = 76.19 : x
  2. Step 2: Convert to fraction form
    89.16/133.15 = 76.19/x
  3. Step 3: Cross multiply
    89.16x = 133.15 × 76.19
  4. Step 4: Simplify right side
    89.16x = 10,143.65
  5. Step 5: Solve for x
    x = 10,143.65/89.16
  6. Step 6: Final answer
    x = 113.77

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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.