Home / 20,380.54-28,125.18-11,428.06

Finding the Fourth Proportional to 20,380.54, 28,125.18 and 11,428.06

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Solution

The fourth proportional to 20,380.54, 28,125.18 and 11,428.06 is: 15,770.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,380.54 : 28,125.18 = 11,428.06 : x
  2. Step 2: Convert to fraction form
    20,380.54/28,125.18 = 11,428.06/x
  3. Step 3: Cross multiply
    20,380.54x = 28,125.18 × 11,428.06
  4. Step 4: Simplify right side
    20,380.54x = 321,416,244.55
  5. Step 5: Solve for x
    x = 321,416,244.55/20,380.54
  6. Step 6: Final answer
    x = 15,770.74

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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.