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Finding the Fourth Proportional to 880.52, 1,321.24 and 639.04

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Solution

The fourth proportional to 880.52, 1,321.24 and 639.04 is: 958.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    880.52 : 1,321.24 = 639.04 : x
  2. Step 2: Convert to fraction form
    880.52/1,321.24 = 639.04/x
  3. Step 3: Cross multiply
    880.52x = 1,321.24 × 639.04
  4. Step 4: Simplify right side
    880.52x = 844,322.19
  5. Step 5: Solve for x
    x = 844,322.19/880.52
  6. Step 6: Final answer
    x = 958.89

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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.