Home / 1,379.11-2,069.16-831.70

Finding the Fourth Proportional to 1,379.11, 2,069.16 and 831.70

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Solution

The fourth proportional to 1,379.11, 2,069.16 and 831.70 is: 1,247.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,379.11 : 2,069.16 = 831.70 : x
  2. Step 2: Convert to fraction form
    1,379.11/2,069.16 = 831.70/x
  3. Step 3: Cross multiply
    1,379.11x = 2,069.16 × 831.70
  4. Step 4: Simplify right side
    1,379.11x = 1,720,920.37
  5. Step 5: Solve for x
    x = 1,720,920.37/1,379.11
  6. Step 6: Final answer
    x = 1,247.85

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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.