Home / 20,815.14-28,723.38-12,857.52

Finding the Fourth Proportional to 20,815.14, 28,723.38 and 12,857.52

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Solution

The fourth proportional to 20,815.14, 28,723.38 and 12,857.52 is: 17,742.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,815.14 : 28,723.38 = 12,857.52 : x
  2. Step 2: Convert to fraction form
    20,815.14/28,723.38 = 12,857.52/x
  3. Step 3: Cross multiply
    20,815.14x = 28,723.38 × 12,857.52
  4. Step 4: Simplify right side
    20,815.14x = 369,311,432.82
  5. Step 5: Solve for x
    x = 369,311,432.82/20,815.14
  6. Step 6: Final answer
    x = 17,742.44

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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.