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Finding the Fourth Proportional to 70.86, 98.28 and 68.88

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Solution

The fourth proportional to 70.86, 98.28 and 68.88 is: 95.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.86 : 98.28 = 68.88 : x
  2. Step 2: Convert to fraction form
    70.86/98.28 = 68.88/x
  3. Step 3: Cross multiply
    70.86x = 98.28 × 68.88
  4. Step 4: Simplify right side
    70.86x = 6,769.53
  5. Step 5: Solve for x
    x = 6,769.53/70.86
  6. Step 6: Final answer
    x = 95.53

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.