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Finding the Fourth Proportional to 103.44, 142.62 and 66.54

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Solution

The fourth proportional to 103.44, 142.62 and 66.54 is: 91.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.44 : 142.62 = 66.54 : x
  2. Step 2: Convert to fraction form
    103.44/142.62 = 66.54/x
  3. Step 3: Cross multiply
    103.44x = 142.62 × 66.54
  4. Step 4: Simplify right side
    103.44x = 9,489.93
  5. Step 5: Solve for x
    x = 9,489.93/103.44
  6. Step 6: Final answer
    x = 91.74

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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.