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Finding the Fourth Proportional to 1,947.80, 2,921.70 and 649.27

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Solution

The fourth proportional to 1,947.80, 2,921.70 and 649.27 is: 973.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,947.80 : 2,921.70 = 649.27 : x
  2. Step 2: Convert to fraction form
    1,947.80/2,921.70 = 649.27/x
  3. Step 3: Cross multiply
    1,947.80x = 2,921.70 × 649.27
  4. Step 4: Simplify right side
    1,947.80x = 1,896,956.33
  5. Step 5: Solve for x
    x = 1,896,956.33/1,947.80
  6. Step 6: Final answer
    x = 973.90

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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.