Home / 20,128.60-27,780.18-12,171.16

Finding the Fourth Proportional to 20,128.60, 27,780.18 and 12,171.16

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Solution

The fourth proportional to 20,128.60, 27,780.18 and 12,171.16 is: 16,797.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,128.60 : 27,780.18 = 12,171.16 : x
  2. Step 2: Convert to fraction form
    20,128.60/27,780.18 = 12,171.16/x
  3. Step 3: Cross multiply
    20,128.60x = 27,780.18 × 12,171.16
  4. Step 4: Simplify right side
    20,128.60x = 338,117,015.61
  5. Step 5: Solve for x
    x = 338,117,015.61/20,128.60
  6. Step 6: Final answer
    x = 16,797.84

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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.