Home / 1,408.11-2,112.77-758.71

Finding the Fourth Proportional to 1,408.11, 2,112.77 and 758.71

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Solution

The fourth proportional to 1,408.11, 2,112.77 and 758.71 is: 1,138.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,408.11 : 2,112.77 = 758.71 : x
  2. Step 2: Convert to fraction form
    1,408.11/2,112.77 = 758.71/x
  3. Step 3: Cross multiply
    1,408.11x = 2,112.77 × 758.71
  4. Step 4: Simplify right side
    1,408.11x = 1,602,979.73
  5. Step 5: Solve for x
    x = 1,602,979.73/1,408.11
  6. Step 6: Final answer
    x = 1,138.39

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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.