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Finding the Fourth Proportional to 1,947.90, 2,920.36 and 974.69

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Solution

The fourth proportional to 1,947.90, 2,920.36 and 974.69 is: 1,461.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,947.90 : 2,920.36 = 974.69 : x
  2. Step 2: Convert to fraction form
    1,947.90/2,920.36 = 974.69/x
  3. Step 3: Cross multiply
    1,947.90x = 2,920.36 × 974.69
  4. Step 4: Simplify right side
    1,947.90x = 2,846,445.69
  5. Step 5: Solve for x
    x = 2,846,445.69/1,947.90
  6. Step 6: Final answer
    x = 1,461.29

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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.