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Finding the Fourth Proportional to 89, 122.91 and 63.26

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Solution

The fourth proportional to 89, 122.91 and 63.26 is: 87.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    89 : 122.91 = 63.26 : x
  2. Step 2: Convert to fraction form
    89/122.91 = 63.26/x
  3. Step 3: Cross multiply
    89x = 122.91 × 63.26
  4. Step 4: Simplify right side
    89x = 7,775.29
  5. Step 5: Solve for x
    x = 7,775.29/89
  6. Step 6: Final answer
    x = 87.36

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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.