Home / 20,383.20-28,130.16-11,431.30

Finding the Fourth Proportional to 20,383.20, 28,130.16 and 11,431.30

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Solution

The fourth proportional to 20,383.20, 28,130.16 and 11,431.30 is: 15,775.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,383.20 : 28,130.16 = 11,431.30 : x
  2. Step 2: Convert to fraction form
    20,383.20/28,130.16 = 11,431.30/x
  3. Step 3: Cross multiply
    20,383.20x = 28,130.16 × 11,431.30
  4. Step 4: Simplify right side
    20,383.20x = 321,564,298.01
  5. Step 5: Solve for x
    x = 321,564,298.01/20,383.20
  6. Step 6: Final answer
    x = 15,775.95

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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.