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Finding the Fourth Proportional to 667.43, 1,000.78 and 282.59

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Solution

The fourth proportional to 667.43, 1,000.78 and 282.59 is: 423.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.43 : 1,000.78 = 282.59 : x
  2. Step 2: Convert to fraction form
    667.43/1,000.78 = 282.59/x
  3. Step 3: Cross multiply
    667.43x = 1,000.78 × 282.59
  4. Step 4: Simplify right side
    667.43x = 282,810.42
  5. Step 5: Solve for x
    x = 282,810.42/667.43
  6. Step 6: Final answer
    x = 423.73

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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.