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Finding the Fourth Proportional to 70.88, 106.38 and 42.12

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Solution

The fourth proportional to 70.88, 106.38 and 42.12 is: 63.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.88 : 106.38 = 42.12 : x
  2. Step 2: Convert to fraction form
    70.88/106.38 = 42.12/x
  3. Step 3: Cross multiply
    70.88x = 106.38 × 42.12
  4. Step 4: Simplify right side
    70.88x = 4,480.73
  5. Step 5: Solve for x
    x = 4,480.73/70.88
  6. Step 6: Final answer
    x = 63.22

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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.