Home / 81,108.54-121,640.94-28,489.32

Finding the Fourth Proportional to 81,108.54, 121,640.94 and 28,489.32

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Solution

The fourth proportional to 81,108.54, 121,640.94 and 28,489.32 is: 42,726.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,108.54 : 121,640.94 = 28,489.32 : x
  2. Step 2: Convert to fraction form
    81,108.54/121,640.94 = 28,489.32/x
  3. Step 3: Cross multiply
    81,108.54x = 121,640.94 × 28,489.32
  4. Step 4: Simplify right side
    81,108.54x = 3,465,467,664.76
  5. Step 5: Solve for x
    x = 3,465,467,664.76/81,108.54
  6. Step 6: Final answer
    x = 42,726.30

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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.