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Finding the Fourth Proportional to 76,879, 115,326.06 and 21,475

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Solution

The fourth proportional to 76,879, 115,326.06 and 21,475 is: 32,214.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,879 : 115,326.06 = 21,475 : x
  2. Step 2: Convert to fraction form
    76,879/115,326.06 = 21,475/x
  3. Step 3: Cross multiply
    76,879x = 115,326.06 × 21,475
  4. Step 4: Simplify right side
    76,879x = 2,476,627,138.50
  5. Step 5: Solve for x
    x = 2,476,627,138.50/76,879
  6. Step 6: Final answer
    x = 32,214.61

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.