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Finding the Fourth Proportional to 1,947.96, 2,921.96 and 649.43

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Solution

The fourth proportional to 1,947.96, 2,921.96 and 649.43 is: 974.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,947.96 : 2,921.96 = 649.43 : x
  2. Step 2: Convert to fraction form
    1,947.96/2,921.96 = 649.43/x
  3. Step 3: Cross multiply
    1,947.96x = 2,921.96 × 649.43
  4. Step 4: Simplify right side
    1,947.96x = 1,897,608.48
  5. Step 5: Solve for x
    x = 1,897,608.48/1,947.96
  6. Step 6: Final answer
    x = 974.15

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Similar ratio
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1.5x scale

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.