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Finding the Fourth Proportional to 21,804.80, 30,080.57 and 12,846.20

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Solution

The fourth proportional to 21,804.80, 30,080.57 and 12,846.20 is: 17,721.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,804.80 : 30,080.57 = 12,846.20 : x
  2. Step 2: Convert to fraction form
    21,804.80/30,080.57 = 12,846.20/x
  3. Step 3: Cross multiply
    21,804.80x = 30,080.57 × 12,846.20
  4. Step 4: Simplify right side
    21,804.80x = 386,420,803.70
  5. Step 5: Solve for x
    x = 386,420,803.70/21,804.80
  6. Step 6: Final answer
    x = 17,721.83

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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.