Home / 78,979.12-108,991.44-47,147.36

Finding the Fourth Proportional to 78,979.12, 108,991.44 and 47,147.36

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Solution

The fourth proportional to 78,979.12, 108,991.44 and 47,147.36 is: 65,063.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,979.12 : 108,991.44 = 47,147.36 : x
  2. Step 2: Convert to fraction form
    78,979.12/108,991.44 = 47,147.36/x
  3. Step 3: Cross multiply
    78,979.12x = 108,991.44 × 47,147.36
  4. Step 4: Simplify right side
    78,979.12x = 5,138,658,658.60
  5. Step 5: Solve for x
    x = 5,138,658,658.60/78,979.12
  6. Step 6: Final answer
    x = 65,063.51

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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.