Home / 81,310.54-121,979.49-28,000.39

Finding the Fourth Proportional to 81,310.54, 121,979.49 and 28,000.39

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Solution

The fourth proportional to 81,310.54, 121,979.49 and 28,000.39 is: 42,005.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,310.54 : 121,979.49 = 28,000.39 : x
  2. Step 2: Convert to fraction form
    81,310.54/121,979.49 = 28,000.39/x
  3. Step 3: Cross multiply
    81,310.54x = 121,979.49 × 28,000.39
  4. Step 4: Simplify right side
    81,310.54x = 3,415,473,292.00
  5. Step 5: Solve for x
    x = 3,415,473,292.00/81,310.54
  6. Step 6: Final answer
    x = 42,005.30

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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.