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Finding the Fourth Proportional to 103.81, 143.25 and 66.96

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Solution

The fourth proportional to 103.81, 143.25 and 66.96 is: 92.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.81 : 143.25 = 66.96 : x
  2. Step 2: Convert to fraction form
    103.81/143.25 = 66.96/x
  3. Step 3: Cross multiply
    103.81x = 143.25 × 66.96
  4. Step 4: Simplify right side
    103.81x = 9,592.02
  5. Step 5: Solve for x
    x = 9,592.02/103.81
  6. Step 6: Final answer
    x = 92.40

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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.