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Finding the Fourth Proportional to 1,382.42, 2,072.79 and 515.72

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Solution

The fourth proportional to 1,382.42, 2,072.79 and 515.72 is: 773.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,382.42 : 2,072.79 = 515.72 : x
  2. Step 2: Convert to fraction form
    1,382.42/2,072.79 = 515.72/x
  3. Step 3: Cross multiply
    1,382.42x = 2,072.79 × 515.72
  4. Step 4: Simplify right side
    1,382.42x = 1,068,979.26
  5. Step 5: Solve for x
    x = 1,068,979.26/1,382.42
  6. Step 6: Final answer
    x = 773.27

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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.