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Finding the Fourth Proportional to 70.70, 105.80 and 54.20

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Solution

The fourth proportional to 70.70, 105.80 and 54.20 is: 81.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.70 : 105.80 = 54.20 : x
  2. Step 2: Convert to fraction form
    70.70/105.80 = 54.20/x
  3. Step 3: Cross multiply
    70.70x = 105.80 × 54.20
  4. Step 4: Simplify right side
    70.70x = 5,734.36
  5. Step 5: Solve for x
    x = 5,734.36/70.70
  6. Step 6: Final answer
    x = 81.11

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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.