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Finding the Fourth Proportional to 89.07, 122.91 and 60

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Solution

The fourth proportional to 89.07, 122.91 and 60 is: 82.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.07 : 122.91 = 60 : x
  2. Step 2: Convert to fraction form
    89.07/122.91 = 60/x
  3. Step 3: Cross multiply
    89.07x = 122.91 × 60
  4. Step 4: Simplify right side
    89.07x = 7,374.60
  5. Step 5: Solve for x
    x = 7,374.60/89.07
  6. Step 6: Final answer
    x = 82.80

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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.