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Finding the Fourth Proportional to 124.73, 171.88 and 89.64

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Solution

The fourth proportional to 124.73, 171.88 and 89.64 is: 123.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.73 : 171.88 = 89.64 : x
  2. Step 2: Convert to fraction form
    124.73/171.88 = 89.64/x
  3. Step 3: Cross multiply
    124.73x = 171.88 × 89.64
  4. Step 4: Simplify right side
    124.73x = 15,408.45
  5. Step 5: Solve for x
    x = 15,408.45/124.73
  6. Step 6: Final answer
    x = 123.54

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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.