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Finding the Fourth Proportional to 1,387.82, 2,081.16 and 738.44

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Solution

The fourth proportional to 1,387.82, 2,081.16 and 738.44 is: 1,107.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,387.82 : 2,081.16 = 738.44 : x
  2. Step 2: Convert to fraction form
    1,387.82/2,081.16 = 738.44/x
  3. Step 3: Cross multiply
    1,387.82x = 2,081.16 × 738.44
  4. Step 4: Simplify right side
    1,387.82x = 1,536,811.79
  5. Step 5: Solve for x
    x = 1,536,811.79/1,387.82
  6. Step 6: Final answer
    x = 1,107.36

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1.5x scale

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.