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Finding the Fourth Proportional to 1,961.74, 2,942.55 and 921.49

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Solution

The fourth proportional to 1,961.74, 2,942.55 and 921.49 is: 1,382.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,961.74 : 2,942.55 = 921.49 : x
  2. Step 2: Convert to fraction form
    1,961.74/2,942.55 = 921.49/x
  3. Step 3: Cross multiply
    1,961.74x = 2,942.55 × 921.49
  4. Step 4: Simplify right side
    1,961.74x = 2,711,515.69
  5. Step 5: Solve for x
    x = 2,711,515.69/1,961.74
  6. Step 6: Final answer
    x = 1,382.20

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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.