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Finding the Fourth Proportional to 103.01, 142.11 and 79.67

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Solution

The fourth proportional to 103.01, 142.11 and 79.67 is: 109.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.01 : 142.11 = 79.67 : x
  2. Step 2: Convert to fraction form
    103.01/142.11 = 79.67/x
  3. Step 3: Cross multiply
    103.01x = 142.11 × 79.67
  4. Step 4: Simplify right side
    103.01x = 11,321.90
  5. Step 5: Solve for x
    x = 11,321.90/103.01
  6. Step 6: Final answer
    x = 109.91

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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.