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Finding the Fourth Proportional to 28,728.65, 39,650.28 and 16,789.66

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Solution

The fourth proportional to 28,728.65, 39,650.28 and 16,789.66 is: 23,172.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,728.65 : 39,650.28 = 16,789.66 : x
  2. Step 2: Convert to fraction form
    28,728.65/39,650.28 = 16,789.66/x
  3. Step 3: Cross multiply
    28,728.65x = 39,650.28 × 16,789.66
  4. Step 4: Simplify right side
    28,728.65x = 665,714,720.10
  5. Step 5: Solve for x
    x = 665,714,720.10/28,728.65
  6. Step 6: Final answer
    x = 23,172.50

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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.