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Finding the Fourth Proportional to 103.48, 155.12 and 42.60

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Solution

The fourth proportional to 103.48, 155.12 and 42.60 is: 63.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.48 : 155.12 = 42.60 : x
  2. Step 2: Convert to fraction form
    103.48/155.12 = 42.60/x
  3. Step 3: Cross multiply
    103.48x = 155.12 × 42.60
  4. Step 4: Simplify right side
    103.48x = 6,608.11
  5. Step 5: Solve for x
    x = 6,608.11/103.48
  6. Step 6: Final answer
    x = 63.86

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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.