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Finding the Fourth Proportional to 667.91, 1,001.40 and 256.70

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Solution

The fourth proportional to 667.91, 1,001.40 and 256.70 is: 384.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.91 : 1,001.40 = 256.70 : x
  2. Step 2: Convert to fraction form
    667.91/1,001.40 = 256.70/x
  3. Step 3: Cross multiply
    667.91x = 1,001.40 × 256.70
  4. Step 4: Simplify right side
    667.91x = 257,058.10
  5. Step 5: Solve for x
    x = 257,058.10/667.91
  6. Step 6: Final answer
    x = 384.87

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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.