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Finding the Fourth Proportional to 103.42, 155.07 and 42.48

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Solution

The fourth proportional to 103.42, 155.07 and 42.48 is: 63.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.42 : 155.07 = 42.48 : x
  2. Step 2: Convert to fraction form
    103.42/155.07 = 42.48/x
  3. Step 3: Cross multiply
    103.42x = 155.07 × 42.48
  4. Step 4: Simplify right side
    103.42x = 6,586.39
  5. Step 5: Solve for x
    x = 6,586.39/103.42
  6. Step 6: Final answer
    x = 63.69

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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.