Home / 20,963.64-31,438.78-6,921.05

Finding the Fourth Proportional to 20,963.64, 31,438.78 and 6,921.05

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Solution

The fourth proportional to 20,963.64, 31,438.78 and 6,921.05 is: 10,379.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,963.64 : 31,438.78 = 6,921.05 : x
  2. Step 2: Convert to fraction form
    20,963.64/31,438.78 = 6,921.05/x
  3. Step 3: Cross multiply
    20,963.64x = 31,438.78 × 6,921.05
  4. Step 4: Simplify right side
    20,963.64x = 217,589,176.52
  5. Step 5: Solve for x
    x = 217,589,176.52/20,963.64
  6. Step 6: Final answer
    x = 10,379.36

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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.