Home / 2,778.90-4,168.38-831.12

Finding the Fourth Proportional to 2,778.90, 4,168.38 and 831.12

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Solution

The fourth proportional to 2,778.90, 4,168.38 and 831.12 is: 1,246.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,778.90 : 4,168.38 = 831.12 : x
  2. Step 2: Convert to fraction form
    2,778.90/4,168.38 = 831.12/x
  3. Step 3: Cross multiply
    2,778.90x = 4,168.38 × 831.12
  4. Step 4: Simplify right side
    2,778.90x = 3,464,423.99
  5. Step 5: Solve for x
    x = 3,464,423.99/2,778.90
  6. Step 6: Final answer
    x = 1,246.69

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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.