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Finding the Fourth Proportional to 18,698.49, 25,806.71 and 11,991.69

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Solution

The fourth proportional to 18,698.49, 25,806.71 and 11,991.69 is: 16,550.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,698.49 : 25,806.71 = 11,991.69 : x
  2. Step 2: Convert to fraction form
    18,698.49/25,806.71 = 11,991.69/x
  3. Step 3: Cross multiply
    18,698.49x = 25,806.71 × 11,991.69
  4. Step 4: Simplify right side
    18,698.49x = 309,466,066.24
  5. Step 5: Solve for x
    x = 309,466,066.24/18,698.49
  6. Step 6: Final answer
    x = 16,550.32

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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.