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Finding the Fourth Proportional to 402.57, 604.21 and 207.71

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Solution

The fourth proportional to 402.57, 604.21 and 207.71 is: 311.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    402.57 : 604.21 = 207.71 : x
  2. Step 2: Convert to fraction form
    402.57/604.21 = 207.71/x
  3. Step 3: Cross multiply
    402.57x = 604.21 × 207.71
  4. Step 4: Simplify right side
    402.57x = 125,497.44
  5. Step 5: Solve for x
    x = 125,497.44/402.57
  6. Step 6: Final answer
    x = 311.74

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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.