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Finding the Fourth Proportional to 1,948.62, 2,922.91 and 487.78

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Solution

The fourth proportional to 1,948.62, 2,922.91 and 487.78 is: 731.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,948.62 : 2,922.91 = 487.78 : x
  2. Step 2: Convert to fraction form
    1,948.62/2,922.91 = 487.78/x
  3. Step 3: Cross multiply
    1,948.62x = 2,922.91 × 487.78
  4. Step 4: Simplify right side
    1,948.62x = 1,425,737.04
  5. Step 5: Solve for x
    x = 1,425,737.04/1,948.62
  6. Step 6: Final answer
    x = 731.66

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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.