Home / 20,489.65-30,728.85-12,981.94

Finding the Fourth Proportional to 20,489.65, 30,728.85 and 12,981.94

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Solution

The fourth proportional to 20,489.65, 30,728.85 and 12,981.94 is: 19,469.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,489.65 : 30,728.85 = 12,981.94 : x
  2. Step 2: Convert to fraction form
    20,489.65/30,728.85 = 12,981.94/x
  3. Step 3: Cross multiply
    20,489.65x = 30,728.85 × 12,981.94
  4. Step 4: Simplify right side
    20,489.65x = 398,920,086.97
  5. Step 5: Solve for x
    x = 398,920,086.97/20,489.65
  6. Step 6: Final answer
    x = 19,469.35

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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.