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Finding the Fourth Proportional to 667.20, 1,001.28 and 282.72

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Solution

The fourth proportional to 667.20, 1,001.28 and 282.72 is: 424.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.20 : 1,001.28 = 282.72 : x
  2. Step 2: Convert to fraction form
    667.20/1,001.28 = 282.72/x
  3. Step 3: Cross multiply
    667.20x = 1,001.28 × 282.72
  4. Step 4: Simplify right side
    667.20x = 283,081.88
  5. Step 5: Solve for x
    x = 283,081.88/667.20
  6. Step 6: Final answer
    x = 424.28

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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.