Home / 20,902.80-31,354.32-5,320.44

Finding the Fourth Proportional to 20,902.80, 31,354.32 and 5,320.44

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Solution

The fourth proportional to 20,902.80, 31,354.32 and 5,320.44 is: 7,980.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,902.80 : 31,354.32 = 5,320.44 : x
  2. Step 2: Convert to fraction form
    20,902.80/31,354.32 = 5,320.44/x
  3. Step 3: Cross multiply
    20,902.80x = 31,354.32 × 5,320.44
  4. Step 4: Simplify right side
    20,902.80x = 166,818,778.30
  5. Step 5: Solve for x
    x = 166,818,778.30/20,902.80
  6. Step 6: Final answer
    x = 7,980.69

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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.