Home / 20,921.53-31,378.84-6,881.73

Finding the Fourth Proportional to 20,921.53, 31,378.84 and 6,881.73

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Solution

The fourth proportional to 20,921.53, 31,378.84 and 6,881.73 is: 10,321.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,921.53 : 31,378.84 = 6,881.73 : x
  2. Step 2: Convert to fraction form
    20,921.53/31,378.84 = 6,881.73/x
  3. Step 3: Cross multiply
    20,921.53x = 31,378.84 × 6,881.73
  4. Step 4: Simplify right side
    20,921.53x = 215,940,730.35
  5. Step 5: Solve for x
    x = 215,940,730.35/20,921.53
  6. Step 6: Final answer
    x = 10,321.46

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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.