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Finding the Fourth Proportional to 1,947.72, 2,920.80 and 921

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Solution

The fourth proportional to 1,947.72, 2,920.80 and 921 is: 1,381.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,947.72 : 2,920.80 = 921 : x
  2. Step 2: Convert to fraction form
    1,947.72/2,920.80 = 921/x
  3. Step 3: Cross multiply
    1,947.72x = 2,920.80 × 921
  4. Step 4: Simplify right side
    1,947.72x = 2,690,056.80
  5. Step 5: Solve for x
    x = 2,690,056.80/1,947.72
  6. Step 6: Final answer
    x = 1,381.13

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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.