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Finding the Fourth Proportional to 1,964.61, 2,947.65 and 868.20

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Solution

The fourth proportional to 1,964.61, 2,947.65 and 868.20 is: 1,302.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,964.61 : 2,947.65 = 868.20 : x
  2. Step 2: Convert to fraction form
    1,964.61/2,947.65 = 868.20/x
  3. Step 3: Cross multiply
    1,964.61x = 2,947.65 × 868.20
  4. Step 4: Simplify right side
    1,964.61x = 2,559,149.73
  5. Step 5: Solve for x
    x = 2,559,149.73/1,964.61
  6. Step 6: Final answer
    x = 1,302.62

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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.