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Finding the Fourth Proportional to 880.38, 1,321.03 and 638.90

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Solution

The fourth proportional to 880.38, 1,321.03 and 638.90 is: 958.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    880.38 : 1,321.03 = 638.90 : x
  2. Step 2: Convert to fraction form
    880.38/1,321.03 = 638.90/x
  3. Step 3: Cross multiply
    880.38x = 1,321.03 × 638.90
  4. Step 4: Simplify right side
    880.38x = 844,005.21
  5. Step 5: Solve for x
    x = 844,005.21/880.38
  6. Step 6: Final answer
    x = 958.68

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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.