Home / 20,982.14-31,408-15,685.96

Finding the Fourth Proportional to 20,982.14, 31,408 and 15,685.96

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Solution

The fourth proportional to 20,982.14, 31,408 and 15,685.96 is: 23,480.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,982.14 : 31,408 = 15,685.96 : x
  2. Step 2: Convert to fraction form
    20,982.14/31,408 = 15,685.96/x
  3. Step 3: Cross multiply
    20,982.14x = 31,408 × 15,685.96
  4. Step 4: Simplify right side
    20,982.14x = 492,664,631.68
  5. Step 5: Solve for x
    x = 492,664,631.68/20,982.14
  6. Step 6: Final answer
    x = 23,480.19

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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.