Home / 20,815.28-31,208.31-7,665.96

Finding the Fourth Proportional to 20,815.28, 31,208.31 and 7,665.96

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Solution

The fourth proportional to 20,815.28, 31,208.31 and 7,665.96 is: 11,493.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,815.28 : 31,208.31 = 7,665.96 : x
  2. Step 2: Convert to fraction form
    20,815.28/31,208.31 = 7,665.96/x
  3. Step 3: Cross multiply
    20,815.28x = 31,208.31 × 7,665.96
  4. Step 4: Simplify right side
    20,815.28x = 239,241,656.13
  5. Step 5: Solve for x
    x = 239,241,656.13/20,815.28
  6. Step 6: Final answer
    x = 11,493.56

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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.