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Finding the Fourth Proportional to 70.32, 104.85 and 67.62

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Solution

The fourth proportional to 70.32, 104.85 and 67.62 is: 100.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.32 : 104.85 = 67.62 : x
  2. Step 2: Convert to fraction form
    70.32/104.85 = 67.62/x
  3. Step 3: Cross multiply
    70.32x = 104.85 × 67.62
  4. Step 4: Simplify right side
    70.32x = 7,089.96
  5. Step 5: Solve for x
    x = 7,089.96/70.32
  6. Step 6: Final answer
    x = 100.82

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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.