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Finding the Fourth Proportional to 89.01, 122.85 and 72.61

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Solution

The fourth proportional to 89.01, 122.85 and 72.61 is: 100.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.01 : 122.85 = 72.61 : x
  2. Step 2: Convert to fraction form
    89.01/122.85 = 72.61/x
  3. Step 3: Cross multiply
    89.01x = 122.85 × 72.61
  4. Step 4: Simplify right side
    89.01x = 8,919.83
  5. Step 5: Solve for x
    x = 8,919.83/89.01
  6. Step 6: Final answer
    x = 100.21

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.