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Finding the Fourth Proportional to 426.74, 640.31 and 207.25

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Solution

The fourth proportional to 426.74, 640.31 and 207.25 is: 310.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    426.74 : 640.31 = 207.25 : x
  2. Step 2: Convert to fraction form
    426.74/640.31 = 207.25/x
  3. Step 3: Cross multiply
    426.74x = 640.31 × 207.25
  4. Step 4: Simplify right side
    426.74x = 132,701.61
  5. Step 5: Solve for x
    x = 132,701.61/426.74
  6. Step 6: Final answer
    x = 310.97

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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.