Home / 20,920.25-31,385.30-6,880.31

Finding the Fourth Proportional to 20,920.25, 31,385.30 and 6,880.31

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Solution

The fourth proportional to 20,920.25, 31,385.30 and 6,880.31 is: 10,322.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,920.25 : 31,385.30 = 6,880.31 : x
  2. Step 2: Convert to fraction form
    20,920.25/31,385.30 = 6,880.31/x
  3. Step 3: Cross multiply
    20,920.25x = 31,385.30 × 6,880.31
  4. Step 4: Simplify right side
    20,920.25x = 215,940,593.44
  5. Step 5: Solve for x
    x = 215,940,593.44/20,920.25
  6. Step 6: Final answer
    x = 10,322.08

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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.