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Finding the Fourth Proportional to 70.89, 106.33 and 67.90

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Solution

The fourth proportional to 70.89, 106.33 and 67.90 is: 101.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.89 : 106.33 = 67.90 : x
  2. Step 2: Convert to fraction form
    70.89/106.33 = 67.90/x
  3. Step 3: Cross multiply
    70.89x = 106.33 × 67.90
  4. Step 4: Simplify right side
    70.89x = 7,219.81
  5. Step 5: Solve for x
    x = 7,219.81/70.89
  6. Step 6: Final answer
    x = 101.85

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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.