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Finding the Fourth Proportional to 103.76, 155.59 and 30.61

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Solution

The fourth proportional to 103.76, 155.59 and 30.61 is: 45.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.76 : 155.59 = 30.61 : x
  2. Step 2: Convert to fraction form
    103.76/155.59 = 30.61/x
  3. Step 3: Cross multiply
    103.76x = 155.59 × 30.61
  4. Step 4: Simplify right side
    103.76x = 4,762.61
  5. Step 5: Solve for x
    x = 4,762.61/103.76
  6. Step 6: Final answer
    x = 45.90

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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.