Home / 20,921.15-31,380.21-6,881.02

Finding the Fourth Proportional to 20,921.15, 31,380.21 and 6,881.02

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Solution

The fourth proportional to 20,921.15, 31,380.21 and 6,881.02 is: 10,321.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,921.15 : 31,380.21 = 6,881.02 : x
  2. Step 2: Convert to fraction form
    20,921.15/31,380.21 = 6,881.02/x
  3. Step 3: Cross multiply
    20,921.15x = 31,380.21 × 6,881.02
  4. Step 4: Simplify right side
    20,921.15x = 215,927,748.36
  5. Step 5: Solve for x
    x = 215,927,748.36/20,921.15
  6. Step 6: Final answer
    x = 10,321.03

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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.