Home / 13,981.90-20,972.85-12,912.70

Finding the Fourth Proportional to 13,981.90, 20,972.85 and 12,912.70

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Solution

The fourth proportional to 13,981.90, 20,972.85 and 12,912.70 is: 19,369.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,981.90 : 20,972.85 = 12,912.70 : x
  2. Step 2: Convert to fraction form
    13,981.90/20,972.85 = 12,912.70/x
  3. Step 3: Cross multiply
    13,981.90x = 20,972.85 × 12,912.70
  4. Step 4: Simplify right side
    13,981.90x = 270,816,120.20
  5. Step 5: Solve for x
    x = 270,816,120.20/13,981.90
  6. Step 6: Final answer
    x = 19,369.05

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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.