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Finding the Fourth Proportional to 103.38, 142.58 and 75.72

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Solution

The fourth proportional to 103.38, 142.58 and 75.72 is: 104.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.38 : 142.58 = 75.72 : x
  2. Step 2: Convert to fraction form
    103.38/142.58 = 75.72/x
  3. Step 3: Cross multiply
    103.38x = 142.58 × 75.72
  4. Step 4: Simplify right side
    103.38x = 10,796.16
  5. Step 5: Solve for x
    x = 10,796.16/103.38
  6. Step 6: Final answer
    x = 104.43

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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.