Home / 20,855.16-31,287.60-6,815.84

Finding the Fourth Proportional to 20,855.16, 31,287.60 and 6,815.84

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Solution

The fourth proportional to 20,855.16, 31,287.60 and 6,815.84 is: 10,225.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,855.16 : 31,287.60 = 6,815.84 : x
  2. Step 2: Convert to fraction form
    20,855.16/31,287.60 = 6,815.84/x
  3. Step 3: Cross multiply
    20,855.16x = 31,287.60 × 6,815.84
  4. Step 4: Simplify right side
    20,855.16x = 213,251,119.15
  5. Step 5: Solve for x
    x = 213,251,119.15/20,855.16
  6. Step 6: Final answer
    x = 10,225.34

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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.