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Finding the Fourth Proportional to 103.47, 142.69 and 66.56

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Solution

The fourth proportional to 103.47, 142.69 and 66.56 is: 91.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.47 : 142.69 = 66.56 : x
  2. Step 2: Convert to fraction form
    103.47/142.69 = 66.56/x
  3. Step 3: Cross multiply
    103.47x = 142.69 × 66.56
  4. Step 4: Simplify right side
    103.47x = 9,497.45
  5. Step 5: Solve for x
    x = 9,497.45/103.47
  6. Step 6: Final answer
    x = 91.79

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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.