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Finding the Fourth Proportional to 252.67, 378.90 and 98.51

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Solution

The fourth proportional to 252.67, 378.90 and 98.51 is: 147.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    252.67 : 378.90 = 98.51 : x
  2. Step 2: Convert to fraction form
    252.67/378.90 = 98.51/x
  3. Step 3: Cross multiply
    252.67x = 378.90 × 98.51
  4. Step 4: Simplify right side
    252.67x = 37,324.95
  5. Step 5: Solve for x
    x = 37,324.95/252.67
  6. Step 6: Final answer
    x = 147.72

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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.