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Finding the Fourth Proportional to 15,879.51, 21,912.12 and 9,167.29

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Solution

The fourth proportional to 15,879.51, 21,912.12 and 9,167.29 is: 12,649.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,879.51 : 21,912.12 = 9,167.29 : x
  2. Step 2: Convert to fraction form
    15,879.51/21,912.12 = 9,167.29/x
  3. Step 3: Cross multiply
    15,879.51x = 21,912.12 × 9,167.29
  4. Step 4: Simplify right side
    15,879.51x = 200,874,734.59
  5. Step 5: Solve for x
    x = 200,874,734.59/15,879.51
  6. Step 6: Final answer
    x = 12,649.94

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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.