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Finding the Fourth Proportional to 98.62, 147.74 and 80.54

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Solution

The fourth proportional to 98.62, 147.74 and 80.54 is: 120.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.62 : 147.74 = 80.54 : x
  2. Step 2: Convert to fraction form
    98.62/147.74 = 80.54/x
  3. Step 3: Cross multiply
    98.62x = 147.74 × 80.54
  4. Step 4: Simplify right side
    98.62x = 11,898.98
  5. Step 5: Solve for x
    x = 11,898.98/98.62
  6. Step 6: Final answer
    x = 120.65

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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.