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Finding the Fourth Proportional to 70.74, 98.28 and 69.39

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Solution

The fourth proportional to 70.74, 98.28 and 69.39 is: 96.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.74 : 98.28 = 69.39 : x
  2. Step 2: Convert to fraction form
    70.74/98.28 = 69.39/x
  3. Step 3: Cross multiply
    70.74x = 98.28 × 69.39
  4. Step 4: Simplify right side
    70.74x = 6,819.65
  5. Step 5: Solve for x
    x = 6,819.65/70.74
  6. Step 6: Final answer
    x = 96.40

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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.