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Finding the Fourth Proportional to 103.42, 155.19 and 69.22

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Solution

The fourth proportional to 103.42, 155.19 and 69.22 is: 103.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.42 : 155.19 = 69.22 : x
  2. Step 2: Convert to fraction form
    103.42/155.19 = 69.22/x
  3. Step 3: Cross multiply
    103.42x = 155.19 × 69.22
  4. Step 4: Simplify right side
    103.42x = 10,741.48
  5. Step 5: Solve for x
    x = 10,741.48/103.42
  6. Step 6: Final answer
    x = 103.87

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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.