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Finding the Fourth Proportional to 397.95, 549.15 and 223.29

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Solution

The fourth proportional to 397.95, 549.15 and 223.29 is: 308.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    397.95 : 549.15 = 223.29 : x
  2. Step 2: Convert to fraction form
    397.95/549.15 = 223.29/x
  3. Step 3: Cross multiply
    397.95x = 549.15 × 223.29
  4. Step 4: Simplify right side
    397.95x = 122,619.70
  5. Step 5: Solve for x
    x = 122,619.70/397.95
  6. Step 6: Final answer
    x = 308.13

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.