Home / 20,380.02-28,126.67-11,428.38

Finding the Fourth Proportional to 20,380.02, 28,126.67 and 11,428.38

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Solution

The fourth proportional to 20,380.02, 28,126.67 and 11,428.38 is: 15,772.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,380.02 : 28,126.67 = 11,428.38 : x
  2. Step 2: Convert to fraction form
    20,380.02/28,126.67 = 11,428.38/x
  3. Step 3: Cross multiply
    20,380.02x = 28,126.67 × 11,428.38
  4. Step 4: Simplify right side
    20,380.02x = 321,442,272.89
  5. Step 5: Solve for x
    x = 321,442,272.89/20,380.02
  6. Step 6: Final answer
    x = 15,772.42

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Half scale
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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.