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Finding the Fourth Proportional to 70.98, 105.78 and 67.92

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Solution

The fourth proportional to 70.98, 105.78 and 67.92 is: 101.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.98 : 105.78 = 67.92 : x
  2. Step 2: Convert to fraction form
    70.98/105.78 = 67.92/x
  3. Step 3: Cross multiply
    70.98x = 105.78 × 67.92
  4. Step 4: Simplify right side
    70.98x = 7,184.58
  5. Step 5: Solve for x
    x = 7,184.58/70.98
  6. Step 6: Final answer
    x = 101.22

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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.