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Finding the Fourth Proportional to 28,728.29, 39,649.68 and 16,789.30

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Solution

The fourth proportional to 28,728.29, 39,649.68 and 16,789.30 is: 23,171.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,728.29 : 39,649.68 = 16,789.30 : x
  2. Step 2: Convert to fraction form
    28,728.29/39,649.68 = 16,789.30/x
  3. Step 3: Cross multiply
    28,728.29x = 39,649.68 × 16,789.30
  4. Step 4: Simplify right side
    28,728.29x = 665,690,273.30
  5. Step 5: Solve for x
    x = 665,690,273.30/28,728.29
  6. Step 6: Final answer
    x = 23,171.94

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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.