Home / 20,121.81-27,787.01-12,964.29

Finding the Fourth Proportional to 20,121.81, 27,787.01 and 12,964.29

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Solution

The fourth proportional to 20,121.81, 27,787.01 and 12,964.29 is: 17,902.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,121.81 : 27,787.01 = 12,964.29 : x
  2. Step 2: Convert to fraction form
    20,121.81/27,787.01 = 12,964.29/x
  3. Step 3: Cross multiply
    20,121.81x = 27,787.01 × 12,964.29
  4. Step 4: Simplify right side
    20,121.81x = 360,238,791.05
  5. Step 5: Solve for x
    x = 360,238,791.05/20,121.81
  6. Step 6: Final answer
    x = 17,902.90

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.