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Finding the Fourth Proportional to 98.28, 147.55 and 76.62

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Solution

The fourth proportional to 98.28, 147.55 and 76.62 is: 115.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.28 : 147.55 = 76.62 : x
  2. Step 2: Convert to fraction form
    98.28/147.55 = 76.62/x
  3. Step 3: Cross multiply
    98.28x = 147.55 × 76.62
  4. Step 4: Simplify right side
    98.28x = 11,305.28
  5. Step 5: Solve for x
    x = 11,305.28/98.28
  6. Step 6: Final answer
    x = 115.03

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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.