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Finding the Fourth Proportional to 887.72, 1,227 and 782

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Solution

The fourth proportional to 887.72, 1,227 and 782 is: 1,080.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    887.72 : 1,227 = 782 : x
  2. Step 2: Convert to fraction form
    887.72/1,227 = 782/x
  3. Step 3: Cross multiply
    887.72x = 1,227 × 782
  4. Step 4: Simplify right side
    887.72x = 959,514
  5. Step 5: Solve for x
    x = 959,514/887.72
  6. Step 6: Final answer
    x = 1,080.87

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.