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Finding the Fourth Proportional to 81,215.52, 121,830.30 and 28,625.46

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Solution

The fourth proportional to 81,215.52, 121,830.30 and 28,625.46 is: 42,940.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,215.52 : 121,830.30 = 28,625.46 : x
  2. Step 2: Convert to fraction form
    81,215.52/121,830.30 = 28,625.46/x
  3. Step 3: Cross multiply
    81,215.52x = 121,830.30 × 28,625.46
  4. Step 4: Simplify right side
    81,215.52x = 3,487,448,379.44
  5. Step 5: Solve for x
    x = 3,487,448,379.44/81,215.52
  6. Step 6: Final answer
    x = 42,940.66

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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.