Home / 20,972.90-31,449.62-7,821.74

Finding the Fourth Proportional to 20,972.90, 31,449.62 and 7,821.74

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Solution

The fourth proportional to 20,972.90, 31,449.62 and 7,821.74 is: 11,728.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,972.90 : 31,449.62 = 7,821.74 : x
  2. Step 2: Convert to fraction form
    20,972.90/31,449.62 = 7,821.74/x
  3. Step 3: Cross multiply
    20,972.90x = 31,449.62 × 7,821.74
  4. Step 4: Simplify right side
    20,972.90x = 245,990,593.49
  5. Step 5: Solve for x
    x = 245,990,593.49/20,972.90
  6. Step 6: Final answer
    x = 11,728.98

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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.