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Finding the Fourth Proportional to 886.87, 1,224.28 and 639.42

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Solution

The fourth proportional to 886.87, 1,224.28 and 639.42 is: 882.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    886.87 : 1,224.28 = 639.42 : x
  2. Step 2: Convert to fraction form
    886.87/1,224.28 = 639.42/x
  3. Step 3: Cross multiply
    886.87x = 1,224.28 × 639.42
  4. Step 4: Simplify right side
    886.87x = 782,829.12
  5. Step 5: Solve for x
    x = 782,829.12/886.87
  6. Step 6: Final answer
    x = 882.69

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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.