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Finding the Fourth Proportional to 1,481.76, 2,220.96 and 615

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Solution

The fourth proportional to 1,481.76, 2,220.96 and 615 is: 921.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,481.76 : 2,220.96 = 615 : x
  2. Step 2: Convert to fraction form
    1,481.76/2,220.96 = 615/x
  3. Step 3: Cross multiply
    1,481.76x = 2,220.96 × 615
  4. Step 4: Simplify right side
    1,481.76x = 1,365,890.40
  5. Step 5: Solve for x
    x = 1,365,890.40/1,481.76
  6. Step 6: Final answer
    x = 921.80

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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.