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Finding the Fourth Proportional to 103.53, 155.43 and 66.85

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Solution

The fourth proportional to 103.53, 155.43 and 66.85 is: 100.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.53 : 155.43 = 66.85 : x
  2. Step 2: Convert to fraction form
    103.53/155.43 = 66.85/x
  3. Step 3: Cross multiply
    103.53x = 155.43 × 66.85
  4. Step 4: Simplify right side
    103.53x = 10,390.76
  5. Step 5: Solve for x
    x = 10,390.76/103.53
  6. Step 6: Final answer
    x = 100.36

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.