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Finding the Fourth Proportional to 403.74, 557.21 and 229.12

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Solution

The fourth proportional to 403.74, 557.21 and 229.12 is: 316.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.74 : 557.21 = 229.12 : x
  2. Step 2: Convert to fraction form
    403.74/557.21 = 229.12/x
  3. Step 3: Cross multiply
    403.74x = 557.21 × 229.12
  4. Step 4: Simplify right side
    403.74x = 127,667.13
  5. Step 5: Solve for x
    x = 127,667.13/403.74
  6. Step 6: Final answer
    x = 316.21

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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.