Home / 21,155.28-31,728.44-13,353.68

Finding the Fourth Proportional to 21,155.28, 31,728.44 and 13,353.68

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Solution

The fourth proportional to 21,155.28, 31,728.44 and 13,353.68 is: 20,027.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,155.28 : 31,728.44 = 13,353.68 : x
  2. Step 2: Convert to fraction form
    21,155.28/31,728.44 = 13,353.68/x
  3. Step 3: Cross multiply
    21,155.28x = 31,728.44 × 13,353.68
  4. Step 4: Simplify right side
    21,155.28x = 423,691,434.66
  5. Step 5: Solve for x
    x = 423,691,434.66/21,155.28
  6. Step 6: Final answer
    x = 20,027.69

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.