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Finding the Fourth Proportional to 98.72, 148.02 and 69.86

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Solution

The fourth proportional to 98.72, 148.02 and 69.86 is: 104.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.72 : 148.02 = 69.86 : x
  2. Step 2: Convert to fraction form
    98.72/148.02 = 69.86/x
  3. Step 3: Cross multiply
    98.72x = 148.02 × 69.86
  4. Step 4: Simplify right side
    98.72x = 10,340.68
  5. Step 5: Solve for x
    x = 10,340.68/98.72
  6. Step 6: Final answer
    x = 104.75

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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.