Home / 3,139.80-4,709.67-831.30

Finding the Fourth Proportional to 3,139.80, 4,709.67 and 831.30

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Solution

The fourth proportional to 3,139.80, 4,709.67 and 831.30 is: 1,246.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,139.80 : 4,709.67 = 831.30 : x
  2. Step 2: Convert to fraction form
    3,139.80/4,709.67 = 831.30/x
  3. Step 3: Cross multiply
    3,139.80x = 4,709.67 × 831.30
  4. Step 4: Simplify right side
    3,139.80x = 3,915,148.67
  5. Step 5: Solve for x
    x = 3,915,148.67/3,139.80
  6. Step 6: Final answer
    x = 1,246.94

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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.