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Finding the Fourth Proportional to 372.71, 558.90 and 218.69

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Solution

The fourth proportional to 372.71, 558.90 and 218.69 is: 327.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    372.71 : 558.90 = 218.69 : x
  2. Step 2: Convert to fraction form
    372.71/558.90 = 218.69/x
  3. Step 3: Cross multiply
    372.71x = 558.90 × 218.69
  4. Step 4: Simplify right side
    372.71x = 122,223.05
  5. Step 5: Solve for x
    x = 122,223.05/372.71
  6. Step 6: Final answer
    x = 327.94

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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.