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Finding the Fourth Proportional to 13,622.79, 18,809.95 and 10,981.99

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Solution

The fourth proportional to 13,622.79, 18,809.95 and 10,981.99 is: 15,163.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,622.79 : 18,809.95 = 10,981.99 : x
  2. Step 2: Convert to fraction form
    13,622.79/18,809.95 = 10,981.99/x
  3. Step 3: Cross multiply
    13,622.79x = 18,809.95 × 10,981.99
  4. Step 4: Simplify right side
    13,622.79x = 206,570,682.80
  5. Step 5: Solve for x
    x = 206,570,682.80/13,622.79
  6. Step 6: Final answer
    x = 15,163.61

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.