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Finding the Fourth Proportional to 18,764.80, 25,891.30 and 11,209.98

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Solution

The fourth proportional to 18,764.80, 25,891.30 and 11,209.98 is: 15,467.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,764.80 : 25,891.30 = 11,209.98 : x
  2. Step 2: Convert to fraction form
    18,764.80/25,891.30 = 11,209.98/x
  3. Step 3: Cross multiply
    18,764.80x = 25,891.30 × 11,209.98
  4. Step 4: Simplify right side
    18,764.80x = 290,240,955.17
  5. Step 5: Solve for x
    x = 290,240,955.17/18,764.80
  6. Step 6: Final answer
    x = 15,467.31

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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.