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Finding the Fourth Proportional to 103.13, 141.89 and 89.27

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Solution

The fourth proportional to 103.13, 141.89 and 89.27 is: 122.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.13 : 141.89 = 89.27 : x
  2. Step 2: Convert to fraction form
    103.13/141.89 = 89.27/x
  3. Step 3: Cross multiply
    103.13x = 141.89 × 89.27
  4. Step 4: Simplify right side
    103.13x = 12,665.36
  5. Step 5: Solve for x
    x = 12,665.36/103.13
  6. Step 6: Final answer
    x = 122.82

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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.