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Finding the Fourth Proportional to 103.61, 155.44 and 42.79

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Solution

The fourth proportional to 103.61, 155.44 and 42.79 is: 64.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.61 : 155.44 = 42.79 : x
  2. Step 2: Convert to fraction form
    103.61/155.44 = 42.79/x
  3. Step 3: Cross multiply
    103.61x = 155.44 × 42.79
  4. Step 4: Simplify right side
    103.61x = 6,650.50
  5. Step 5: Solve for x
    x = 6,650.50/103.61
  6. Step 6: Final answer
    x = 64.19

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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.