Home / 20,772.28-31,139.88-7,621.60

Finding the Fourth Proportional to 20,772.28, 31,139.88 and 7,621.60

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Solution

The fourth proportional to 20,772.28, 31,139.88 and 7,621.60 is: 11,425.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,772.28 : 31,139.88 = 7,621.60 : x
  2. Step 2: Convert to fraction form
    20,772.28/31,139.88 = 7,621.60/x
  3. Step 3: Cross multiply
    20,772.28x = 31,139.88 × 7,621.60
  4. Step 4: Simplify right side
    20,772.28x = 237,335,709.41
  5. Step 5: Solve for x
    x = 237,335,709.41/20,772.28
  6. Step 6: Final answer
    x = 11,425.60

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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.