Home / 20,972.72-31,426.44-7,821.56

Finding the Fourth Proportional to 20,972.72, 31,426.44 and 7,821.56

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Solution

The fourth proportional to 20,972.72, 31,426.44 and 7,821.56 is: 11,720.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,972.72 : 31,426.44 = 7,821.56 : x
  2. Step 2: Convert to fraction form
    20,972.72/31,426.44 = 7,821.56/x
  3. Step 3: Cross multiply
    20,972.72x = 31,426.44 × 7,821.56
  4. Step 4: Simplify right side
    20,972.72x = 245,803,786.05
  5. Step 5: Solve for x
    x = 245,803,786.05/20,972.72
  6. Step 6: Final answer
    x = 11,720.17

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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.