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Finding the Fourth Proportional to 15,879.66, 21,914.92 and 9,166.51

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Solution

The fourth proportional to 15,879.66, 21,914.92 and 9,166.51 is: 12,650.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,879.66 : 21,914.92 = 9,166.51 : x
  2. Step 2: Convert to fraction form
    15,879.66/21,914.92 = 9,166.51/x
  3. Step 3: Cross multiply
    15,879.66x = 21,914.92 × 9,166.51
  4. Step 4: Simplify right side
    15,879.66x = 200,883,333.33
  5. Step 5: Solve for x
    x = 200,883,333.33/15,879.66
  6. Step 6: Final answer
    x = 12,650.35

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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.