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Finding the Fourth Proportional to 1,382.90, 2,074.81 and 458.42

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Solution

The fourth proportional to 1,382.90, 2,074.81 and 458.42 is: 687.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,382.90 : 2,074.81 = 458.42 : x
  2. Step 2: Convert to fraction form
    1,382.90/2,074.81 = 458.42/x
  3. Step 3: Cross multiply
    1,382.90x = 2,074.81 × 458.42
  4. Step 4: Simplify right side
    1,382.90x = 951,134.40
  5. Step 5: Solve for x
    x = 951,134.40/1,382.90
  6. Step 6: Final answer
    x = 687.78

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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.