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Finding the Fourth Proportional to 372.80, 558.33 and 218.40

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Solution

The fourth proportional to 372.80, 558.33 and 218.40 is: 327.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    372.80 : 558.33 = 218.40 : x
  2. Step 2: Convert to fraction form
    372.80/558.33 = 218.40/x
  3. Step 3: Cross multiply
    372.80x = 558.33 × 218.40
  4. Step 4: Simplify right side
    372.80x = 121,939.27
  5. Step 5: Solve for x
    x = 121,939.27/372.80
  6. Step 6: Final answer
    x = 327.09

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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.