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Finding the Fourth Proportional to 103.45, 141.92 and 100.76

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Solution

The fourth proportional to 103.45, 141.92 and 100.76 is: 138.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.45 : 141.92 = 100.76 : x
  2. Step 2: Convert to fraction form
    103.45/141.92 = 100.76/x
  3. Step 3: Cross multiply
    103.45x = 141.92 × 100.76
  4. Step 4: Simplify right side
    103.45x = 14,299.86
  5. Step 5: Solve for x
    x = 14,299.86/103.45
  6. Step 6: Final answer
    x = 138.23

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.