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Finding the Fourth Proportional to 89.89, 124.20 and 71.60

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Solution

The fourth proportional to 89.89, 124.20 and 71.60 is: 98.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.89 : 124.20 = 71.60 : x
  2. Step 2: Convert to fraction form
    89.89/124.20 = 71.60/x
  3. Step 3: Cross multiply
    89.89x = 124.20 × 71.60
  4. Step 4: Simplify right side
    89.89x = 8,892.10
  5. Step 5: Solve for x
    x = 8,892.10/89.89
  6. Step 6: Final answer
    x = 98.92

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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.