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Finding the Fourth Proportional to 880.71, 1,321.20 and 515.31

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Solution

The fourth proportional to 880.71, 1,321.20 and 515.31 is: 773.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    880.71 : 1,321.20 = 515.31 : x
  2. Step 2: Convert to fraction form
    880.71/1,321.20 = 515.31/x
  3. Step 3: Cross multiply
    880.71x = 1,321.20 × 515.31
  4. Step 4: Simplify right side
    880.71x = 680,827.57
  5. Step 5: Solve for x
    x = 680,827.57/880.71
  6. Step 6: Final answer
    x = 773.04

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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.