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Finding the Fourth Proportional to 880.43, 1,321.10 and 638.95

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Solution

The fourth proportional to 880.43, 1,321.10 and 638.95 is: 958.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    880.43 : 1,321.10 = 638.95 : x
  2. Step 2: Convert to fraction form
    880.43/1,321.10 = 638.95/x
  3. Step 3: Cross multiply
    880.43x = 1,321.10 × 638.95
  4. Step 4: Simplify right side
    880.43x = 844,110.24
  5. Step 5: Solve for x
    x = 844,110.24/880.43
  6. Step 6: Final answer
    x = 958.75

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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.