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Finding the Fourth Proportional to 103.12, 155.54 and 92.56

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Solution

The fourth proportional to 103.12, 155.54 and 92.56 is: 139.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.12 : 155.54 = 92.56 : x
  2. Step 2: Convert to fraction form
    103.12/155.54 = 92.56/x
  3. Step 3: Cross multiply
    103.12x = 155.54 × 92.56
  4. Step 4: Simplify right side
    103.12x = 14,396.78
  5. Step 5: Solve for x
    x = 14,396.78/103.12
  6. Step 6: Final answer
    x = 139.61

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.