Home / 20,880.73-28,816.58-12,387.88

Finding the Fourth Proportional to 20,880.73, 28,816.58 and 12,387.88

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Solution

The fourth proportional to 20,880.73, 28,816.58 and 12,387.88 is: 17,095.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,880.73 : 28,816.58 = 12,387.88 : x
  2. Step 2: Convert to fraction form
    20,880.73/28,816.58 = 12,387.88/x
  3. Step 3: Cross multiply
    20,880.73x = 28,816.58 × 12,387.88
  4. Step 4: Simplify right side
    20,880.73x = 356,976,335.05
  5. Step 5: Solve for x
    x = 356,976,335.05/20,880.73
  6. Step 6: Final answer
    x = 17,095.97

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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.