Home / 31,831.20-47,768.40-20,710.80

Finding the Fourth Proportional to 31,831.20, 47,768.40 and 20,710.80

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Solution

The fourth proportional to 31,831.20, 47,768.40 and 20,710.80 is: 31,080.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,831.20 : 47,768.40 = 20,710.80 : x
  2. Step 2: Convert to fraction form
    31,831.20/47,768.40 = 20,710.80/x
  3. Step 3: Cross multiply
    31,831.20x = 47,768.40 × 20,710.80
  4. Step 4: Simplify right side
    31,831.20x = 989,321,778.72
  5. Step 5: Solve for x
    x = 989,321,778.72/31,831.20
  6. Step 6: Final answer
    x = 31,080.25

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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.