Home / 31,836.20-47,775.90-20,715.80

Finding the Fourth Proportional to 31,836.20, 47,775.90 and 20,715.80

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Solution

The fourth proportional to 31,836.20, 47,775.90 and 20,715.80 is: 31,087.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,836.20 : 47,775.90 = 20,715.80 : x
  2. Step 2: Convert to fraction form
    31,836.20/47,775.90 = 20,715.80/x
  3. Step 3: Cross multiply
    31,836.20x = 47,775.90 × 20,715.80
  4. Step 4: Simplify right side
    31,836.20x = 989,715,989.22
  5. Step 5: Solve for x
    x = 989,715,989.22/31,836.20
  6. Step 6: Final answer
    x = 31,087.76

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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.