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Finding the Fourth Proportional to 103.56, 155.39 and 42.74

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Solution

The fourth proportional to 103.56, 155.39 and 42.74 is: 64.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.56 : 155.39 = 42.74 : x
  2. Step 2: Convert to fraction form
    103.56/155.39 = 42.74/x
  3. Step 3: Cross multiply
    103.56x = 155.39 × 42.74
  4. Step 4: Simplify right side
    103.56x = 6,640.38
  5. Step 5: Solve for x
    x = 6,640.38/103.56
  6. Step 6: Final answer
    x = 64.12

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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.