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Finding the Fourth Proportional to 7,872.40, 11,808.54 and 2,943.28

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Solution

The fourth proportional to 7,872.40, 11,808.54 and 2,943.28 is: 4,414.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,872.40 : 11,808.54 = 2,943.28 : x
  2. Step 2: Convert to fraction form
    7,872.40/11,808.54 = 2,943.28/x
  3. Step 3: Cross multiply
    7,872.40x = 11,808.54 × 2,943.28
  4. Step 4: Simplify right side
    7,872.40x = 34,755,839.61
  5. Step 5: Solve for x
    x = 34,755,839.61/7,872.40
  6. Step 6: Final answer
    x = 4,414.90

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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.