Home / 31,891.20-47,836.80-20,217.60

Finding the Fourth Proportional to 31,891.20, 47,836.80 and 20,217.60

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Solution

The fourth proportional to 31,891.20, 47,836.80 and 20,217.60 is: 30,326.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,891.20 : 47,836.80 = 20,217.60 : x
  2. Step 2: Convert to fraction form
    31,891.20/47,836.80 = 20,217.60/x
  3. Step 3: Cross multiply
    31,891.20x = 47,836.80 × 20,217.60
  4. Step 4: Simplify right side
    31,891.20x = 967,145,287.68
  5. Step 5: Solve for x
    x = 967,145,287.68/31,891.20
  6. Step 6: Final answer
    x = 30,326.40

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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.