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Finding the Fourth Proportional to 372.72, 558.76 and 218.80

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Solution

The fourth proportional to 372.72, 558.76 and 218.80 is: 328.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    372.72 : 558.76 = 218.80 : x
  2. Step 2: Convert to fraction form
    372.72/558.76 = 218.80/x
  3. Step 3: Cross multiply
    372.72x = 558.76 × 218.80
  4. Step 4: Simplify right side
    372.72x = 122,256.69
  5. Step 5: Solve for x
    x = 122,256.69/372.72
  6. Step 6: Final answer
    x = 328.01

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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.