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Finding the Fourth Proportional to 13,994.76, 20,998.20 and 6,981.78

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Solution

The fourth proportional to 13,994.76, 20,998.20 and 6,981.78 is: 10,475.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,994.76 : 20,998.20 = 6,981.78 : x
  2. Step 2: Convert to fraction form
    13,994.76/20,998.20 = 6,981.78/x
  3. Step 3: Cross multiply
    13,994.76x = 20,998.20 × 6,981.78
  4. Step 4: Simplify right side
    13,994.76x = 146,604,812.80
  5. Step 5: Solve for x
    x = 146,604,812.80/13,994.76
  6. Step 6: Final answer
    x = 10,475.69

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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.