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Finding the Fourth Proportional to 1,947.90, 2,921.87 and 649.37

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Solution

The fourth proportional to 1,947.90, 2,921.87 and 649.37 is: 974.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,947.90 : 2,921.87 = 649.37 : x
  2. Step 2: Convert to fraction form
    1,947.90/2,921.87 = 649.37/x
  3. Step 3: Cross multiply
    1,947.90x = 2,921.87 × 649.37
  4. Step 4: Simplify right side
    1,947.90x = 1,897,356.87
  5. Step 5: Solve for x
    x = 1,897,356.87/1,947.90
  6. Step 6: Final answer
    x = 974.05

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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.