Home / 20,921.52-31,375.60-6,878.32

Finding the Fourth Proportional to 20,921.52, 31,375.60 and 6,878.32

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Solution

The fourth proportional to 20,921.52, 31,375.60 and 6,878.32 is: 10,315.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,921.52 : 31,375.60 = 6,878.32 : x
  2. Step 2: Convert to fraction form
    20,921.52/31,375.60 = 6,878.32/x
  3. Step 3: Cross multiply
    20,921.52x = 31,375.60 × 6,878.32
  4. Step 4: Simplify right side
    20,921.52x = 215,811,416.99
  5. Step 5: Solve for x
    x = 215,811,416.99/20,921.52
  6. Step 6: Final answer
    x = 10,315.28

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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.