Home / 20,869.31-31,305.40-8,389.34

Finding the Fourth Proportional to 20,869.31, 31,305.40 and 8,389.34

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Solution

The fourth proportional to 20,869.31, 31,305.40 and 8,389.34 is: 12,584.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,869.31 : 31,305.40 = 8,389.34 : x
  2. Step 2: Convert to fraction form
    20,869.31/31,305.40 = 8,389.34/x
  3. Step 3: Cross multiply
    20,869.31x = 31,305.40 × 8,389.34
  4. Step 4: Simplify right side
    20,869.31x = 262,631,584.33
  5. Step 5: Solve for x
    x = 262,631,584.33/20,869.31
  6. Step 6: Final answer
    x = 12,584.58

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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.