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Finding the Fourth Proportional to 103.73, 143.03 and 66.87

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Solution

The fourth proportional to 103.73, 143.03 and 66.87 is: 92.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.73 : 143.03 = 66.87 : x
  2. Step 2: Convert to fraction form
    103.73/143.03 = 66.87/x
  3. Step 3: Cross multiply
    103.73x = 143.03 × 66.87
  4. Step 4: Simplify right side
    103.73x = 9,564.08
  5. Step 5: Solve for x
    x = 9,564.08/103.73
  6. Step 6: Final answer
    x = 92.21

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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.