Home / 20,380.52-28,127.36-11,428.88

Finding the Fourth Proportional to 20,380.52, 28,127.36 and 11,428.88

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Solution

The fourth proportional to 20,380.52, 28,127.36 and 11,428.88 is: 15,773.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,380.52 : 28,127.36 = 11,428.88 : x
  2. Step 2: Convert to fraction form
    20,380.52/28,127.36 = 11,428.88/x
  3. Step 3: Cross multiply
    20,380.52x = 28,127.36 × 11,428.88
  4. Step 4: Simplify right side
    20,380.52x = 321,464,222.16
  5. Step 5: Solve for x
    x = 321,464,222.16/20,380.52
  6. Step 6: Final answer
    x = 15,773.11

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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.