Home / 20,787.05-31,183.64-7,638.38

Finding the Fourth Proportional to 20,787.05, 31,183.64 and 7,638.38

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Solution

The fourth proportional to 20,787.05, 31,183.64 and 7,638.38 is: 11,458.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,787.05 : 31,183.64 = 7,638.38 : x
  2. Step 2: Convert to fraction form
    20,787.05/31,183.64 = 7,638.38/x
  3. Step 3: Cross multiply
    20,787.05x = 31,183.64 × 7,638.38
  4. Step 4: Simplify right side
    20,787.05x = 238,192,589.16
  5. Step 5: Solve for x
    x = 238,192,589.16/20,787.05
  6. Step 6: Final answer
    x = 11,458.70

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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.