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Finding the Fourth Proportional to 1,382.79, 2,074.39 and 505.34

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Solution

The fourth proportional to 1,382.79, 2,074.39 and 505.34 is: 758.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,382.79 : 2,074.39 = 505.34 : x
  2. Step 2: Convert to fraction form
    1,382.79/2,074.39 = 505.34/x
  3. Step 3: Cross multiply
    1,382.79x = 2,074.39 × 505.34
  4. Step 4: Simplify right side
    1,382.79x = 1,048,260.61
  5. Step 5: Solve for x
    x = 1,048,260.61/1,382.79
  6. Step 6: Final answer
    x = 758.08

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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.