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Finding the Fourth Proportional to 2,912.52, 4,368.78 and 721.29

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Solution

The fourth proportional to 2,912.52, 4,368.78 and 721.29 is: 1,081.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,912.52 : 4,368.78 = 721.29 : x
  2. Step 2: Convert to fraction form
    2,912.52/4,368.78 = 721.29/x
  3. Step 3: Cross multiply
    2,912.52x = 4,368.78 × 721.29
  4. Step 4: Simplify right side
    2,912.52x = 3,151,157.33
  5. Step 5: Solve for x
    x = 3,151,157.33/2,912.52
  6. Step 6: Final answer
    x = 1,081.94

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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.