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Finding the Fourth Proportional to 70.20, 104.88 and 57.18

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Solution

The fourth proportional to 70.20, 104.88 and 57.18 is: 85.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.20 : 104.88 = 57.18 : x
  2. Step 2: Convert to fraction form
    70.20/104.88 = 57.18/x
  3. Step 3: Cross multiply
    70.20x = 104.88 × 57.18
  4. Step 4: Simplify right side
    70.20x = 5,997.04
  5. Step 5: Solve for x
    x = 5,997.04/70.20
  6. Step 6: Final answer
    x = 85.43

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.