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Finding the Fourth Proportional to 883.59, 1,324.98 and 639.78

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Solution

The fourth proportional to 883.59, 1,324.98 and 639.78 is: 959.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    883.59 : 1,324.98 = 639.78 : x
  2. Step 2: Convert to fraction form
    883.59/1,324.98 = 639.78/x
  3. Step 3: Cross multiply
    883.59x = 1,324.98 × 639.78
  4. Step 4: Simplify right side
    883.59x = 847,695.70
  5. Step 5: Solve for x
    x = 847,695.70/883.59
  6. Step 6: Final answer
    x = 959.38

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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.