Home / 20,405.18-28,159.44-12,021.68

Finding the Fourth Proportional to 20,405.18, 28,159.44 and 12,021.68

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Solution

The fourth proportional to 20,405.18, 28,159.44 and 12,021.68 is: 16,590.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,405.18 : 28,159.44 = 12,021.68 : x
  2. Step 2: Convert to fraction form
    20,405.18/28,159.44 = 12,021.68/x
  3. Step 3: Cross multiply
    20,405.18x = 28,159.44 × 12,021.68
  4. Step 4: Simplify right side
    20,405.18x = 338,523,776.66
  5. Step 5: Solve for x
    x = 338,523,776.66/20,405.18
  6. Step 6: Final answer
    x = 16,590.09

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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.