Home / 31,391.20-47,043.60-20,831.20

Finding the Fourth Proportional to 31,391.20, 47,043.60 and 20,831.20

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Solution

The fourth proportional to 31,391.20, 47,043.60 and 20,831.20 is: 31,218.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,391.20 : 47,043.60 = 20,831.20 : x
  2. Step 2: Convert to fraction form
    31,391.20/47,043.60 = 20,831.20/x
  3. Step 3: Cross multiply
    31,391.20x = 47,043.60 × 20,831.20
  4. Step 4: Simplify right side
    31,391.20x = 979,974,640.32
  5. Step 5: Solve for x
    x = 979,974,640.32/31,391.20
  6. Step 6: Final answer
    x = 31,218.13

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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.