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Finding the Fourth Proportional to 28,749.80, 39,679.42 and 16,810.80

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Solution

The fourth proportional to 28,749.80, 39,679.42 and 16,810.80 is: 23,201.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,749.80 : 39,679.42 = 16,810.80 : x
  2. Step 2: Convert to fraction form
    28,749.80/39,679.42 = 16,810.80/x
  3. Step 3: Cross multiply
    28,749.80x = 39,679.42 × 16,810.80
  4. Step 4: Simplify right side
    28,749.80x = 667,042,793.74
  5. Step 5: Solve for x
    x = 667,042,793.74/28,749.80
  6. Step 6: Final answer
    x = 23,201.65

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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.