Home / 20,381.58-28,115.19-12,825.09

Finding the Fourth Proportional to 20,381.58, 28,115.19 and 12,825.09

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Solution

The fourth proportional to 20,381.58, 28,115.19 and 12,825.09 is: 17,691.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,381.58 : 28,115.19 = 12,825.09 : x
  2. Step 2: Convert to fraction form
    20,381.58/28,115.19 = 12,825.09/x
  3. Step 3: Cross multiply
    20,381.58x = 28,115.19 × 12,825.09
  4. Step 4: Simplify right side
    20,381.58x = 360,579,842.12
  5. Step 5: Solve for x
    x = 360,579,842.12/20,381.58
  6. Step 6: Final answer
    x = 17,691.46

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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.