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Finding the Fourth Proportional to 105.55, 158.34 and 54.18

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Solution

The fourth proportional to 105.55, 158.34 and 54.18 is: 81.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    105.55 : 158.34 = 54.18 : x
  2. Step 2: Convert to fraction form
    105.55/158.34 = 54.18/x
  3. Step 3: Cross multiply
    105.55x = 158.34 × 54.18
  4. Step 4: Simplify right side
    105.55x = 8,578.86
  5. Step 5: Solve for x
    x = 8,578.86/105.55
  6. Step 6: Final answer
    x = 81.28

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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.