Home / 3,140.20-4,710.60-831.70

Finding the Fourth Proportional to 3,140.20, 4,710.60 and 831.70

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Solution

The fourth proportional to 3,140.20, 4,710.60 and 831.70 is: 1,247.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,140.20 : 4,710.60 = 831.70 : x
  2. Step 2: Convert to fraction form
    3,140.20/4,710.60 = 831.70/x
  3. Step 3: Cross multiply
    3,140.20x = 4,710.60 × 831.70
  4. Step 4: Simplify right side
    3,140.20x = 3,917,806.02
  5. Step 5: Solve for x
    x = 3,917,806.02/3,140.20
  6. Step 6: Final answer
    x = 1,247.63

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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.