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Finding the Fourth Proportional to 2,676.80, 4,014.79 and 921.53

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Solution

The fourth proportional to 2,676.80, 4,014.79 and 921.53 is: 1,382.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,676.80 : 4,014.79 = 921.53 : x
  2. Step 2: Convert to fraction form
    2,676.80/4,014.79 = 921.53/x
  3. Step 3: Cross multiply
    2,676.80x = 4,014.79 × 921.53
  4. Step 4: Simplify right side
    2,676.80x = 3,699,727.05
  5. Step 5: Solve for x
    x = 3,699,727.05/2,676.80
  6. Step 6: Final answer
    x = 1,382.15

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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.