Home / 20,815.20-31,222.80-6,964.20

Finding the Fourth Proportional to 20,815.20, 31,222.80 and 6,964.20

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Solution

The fourth proportional to 20,815.20, 31,222.80 and 6,964.20 is: 10,446.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,815.20 : 31,222.80 = 6,964.20 : x
  2. Step 2: Convert to fraction form
    20,815.20/31,222.80 = 6,964.20/x
  3. Step 3: Cross multiply
    20,815.20x = 31,222.80 × 6,964.20
  4. Step 4: Simplify right side
    20,815.20x = 217,441,823.76
  5. Step 5: Solve for x
    x = 217,441,823.76/20,815.20
  6. Step 6: Final answer
    x = 10,446.30

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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.