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Finding the Fourth Proportional to 881.25, 1,321.85 and 511.60

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Solution

The fourth proportional to 881.25, 1,321.85 and 511.60 is: 767.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    881.25 : 1,321.85 = 511.60 : x
  2. Step 2: Convert to fraction form
    881.25/1,321.85 = 511.60/x
  3. Step 3: Cross multiply
    881.25x = 1,321.85 × 511.60
  4. Step 4: Simplify right side
    881.25x = 676,255.90
  5. Step 5: Solve for x
    x = 676,255.90/881.25
  6. Step 6: Final answer
    x = 767.39

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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.