Home / 20,824.38-31,239.81-6,781.09

Finding the Fourth Proportional to 20,824.38, 31,239.81 and 6,781.09

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Solution

The fourth proportional to 20,824.38, 31,239.81 and 6,781.09 is: 10,172.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,824.38 : 31,239.81 = 6,781.09 : x
  2. Step 2: Convert to fraction form
    20,824.38/31,239.81 = 6,781.09/x
  3. Step 3: Cross multiply
    20,824.38x = 31,239.81 × 6,781.09
  4. Step 4: Simplify right side
    20,824.38x = 211,839,963.19
  5. Step 5: Solve for x
    x = 211,839,963.19/20,824.38
  6. Step 6: Final answer
    x = 10,172.69

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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.