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Finding the Fourth Proportional to 674.39, 1,011.78 and 257.87

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Solution

The fourth proportional to 674.39, 1,011.78 and 257.87 is: 386.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    674.39 : 1,011.78 = 257.87 : x
  2. Step 2: Convert to fraction form
    674.39/1,011.78 = 257.87/x
  3. Step 3: Cross multiply
    674.39x = 1,011.78 × 257.87
  4. Step 4: Simplify right side
    674.39x = 260,910.24
  5. Step 5: Solve for x
    x = 260,910.24/674.39
  6. Step 6: Final answer
    x = 386.88

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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.