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Finding the Fourth Proportional to 15,879.33, 21,913.31 and 8,805.69

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Solution

The fourth proportional to 15,879.33, 21,913.31 and 8,805.69 is: 12,151.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,879.33 : 21,913.31 = 8,805.69 : x
  2. Step 2: Convert to fraction form
    15,879.33/21,913.31 = 8,805.69/x
  3. Step 3: Cross multiply
    15,879.33x = 21,913.31 × 8,805.69
  4. Step 4: Simplify right side
    15,879.33x = 192,961,770.71
  5. Step 5: Solve for x
    x = 192,961,770.71/15,879.33
  6. Step 6: Final answer
    x = 12,151.76

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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.