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Finding the Fourth Proportional to 18,990.80, 26,205.64 and 11,440.08

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Solution

The fourth proportional to 18,990.80, 26,205.64 and 11,440.08 is: 15,786.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,990.80 : 26,205.64 = 11,440.08 : x
  2. Step 2: Convert to fraction form
    18,990.80/26,205.64 = 11,440.08/x
  3. Step 3: Cross multiply
    18,990.80x = 26,205.64 × 11,440.08
  4. Step 4: Simplify right side
    18,990.80x = 299,794,618.05
  5. Step 5: Solve for x
    x = 299,794,618.05/18,990.80
  6. Step 6: Final answer
    x = 15,786.31

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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.