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Finding the Fourth Proportional to 257.46, 387.57 and 231

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Solution

The fourth proportional to 257.46, 387.57 and 231 is: 347.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.46 : 387.57 = 231 : x
  2. Step 2: Convert to fraction form
    257.46/387.57 = 231/x
  3. Step 3: Cross multiply
    257.46x = 387.57 × 231
  4. Step 4: Simplify right side
    257.46x = 89,528.67
  5. Step 5: Solve for x
    x = 89,528.67/257.46
  6. Step 6: Final answer
    x = 347.74

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.