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Finding the Fourth Proportional to 2,560.56, 3,839.90 and 916.66

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Solution

The fourth proportional to 2,560.56, 3,839.90 and 916.66 is: 1,374.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,560.56 : 3,839.90 = 916.66 : x
  2. Step 2: Convert to fraction form
    2,560.56/3,839.90 = 916.66/x
  3. Step 3: Cross multiply
    2,560.56x = 3,839.90 × 916.66
  4. Step 4: Simplify right side
    2,560.56x = 3,519,882.73
  5. Step 5: Solve for x
    x = 3,519,882.73/2,560.56
  6. Step 6: Final answer
    x = 1,374.65

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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.