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Finding the Fourth Proportional to 15,879.69, 21,914.39 and 8,709.92

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Solution

The fourth proportional to 15,879.69, 21,914.39 and 8,709.92 is: 12,019.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,879.69 : 21,914.39 = 8,709.92 : x
  2. Step 2: Convert to fraction form
    15,879.69/21,914.39 = 8,709.92/x
  3. Step 3: Cross multiply
    15,879.69x = 21,914.39 × 8,709.92
  4. Step 4: Simplify right side
    15,879.69x = 190,872,486.07
  5. Step 5: Solve for x
    x = 190,872,486.07/15,879.69
  6. Step 6: Final answer
    x = 12,019.91

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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.