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Finding the Fourth Proportional to 249.12, 371.88 and 215.10

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Solution

The fourth proportional to 249.12, 371.88 and 215.10 is: 321.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    249.12 : 371.88 = 215.10 : x
  2. Step 2: Convert to fraction form
    249.12/371.88 = 215.10/x
  3. Step 3: Cross multiply
    249.12x = 371.88 × 215.10
  4. Step 4: Simplify right side
    249.12x = 79,991.39
  5. Step 5: Solve for x
    x = 79,991.39/249.12
  6. Step 6: Final answer
    x = 321.10

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.