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Finding the Fourth Proportional to 887.57, 1,224.97 and 639.71

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Solution

The fourth proportional to 887.57, 1,224.97 and 639.71 is: 882.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    887.57 : 1,224.97 = 639.71 : x
  2. Step 2: Convert to fraction form
    887.57/1,224.97 = 639.71/x
  3. Step 3: Cross multiply
    887.57x = 1,224.97 × 639.71
  4. Step 4: Simplify right side
    887.57x = 783,627.02
  5. Step 5: Solve for x
    x = 783,627.02/887.57
  6. Step 6: Final answer
    x = 882.89

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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.