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Finding the Fourth Proportional to 70.57, 105.74 and 67.90

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Solution

The fourth proportional to 70.57, 105.74 and 67.90 is: 101.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.57 : 105.74 = 67.90 : x
  2. Step 2: Convert to fraction form
    70.57/105.74 = 67.90/x
  3. Step 3: Cross multiply
    70.57x = 105.74 × 67.90
  4. Step 4: Simplify right side
    70.57x = 7,179.75
  5. Step 5: Solve for x
    x = 7,179.75/70.57
  6. Step 6: Final answer
    x = 101.74

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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.