Home / 20,820.87-31,209.44-7,664.85

Finding the Fourth Proportional to 20,820.87, 31,209.44 and 7,664.85

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Solution

The fourth proportional to 20,820.87, 31,209.44 and 7,664.85 is: 11,489.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,820.87 : 31,209.44 = 7,664.85 : x
  2. Step 2: Convert to fraction form
    20,820.87/31,209.44 = 7,664.85/x
  3. Step 3: Cross multiply
    20,820.87x = 31,209.44 × 7,664.85
  4. Step 4: Simplify right side
    20,820.87x = 239,215,637.86
  5. Step 5: Solve for x
    x = 239,215,637.86/20,820.87
  6. Step 6: Final answer
    x = 11,489.22

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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.