Home / 78,871.09-108,759.24-51,979.20

Finding the Fourth Proportional to 78,871.09, 108,759.24 and 51,979.20

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Solution

The fourth proportional to 78,871.09, 108,759.24 and 51,979.20 is: 71,676.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,871.09 : 108,759.24 = 51,979.20 : x
  2. Step 2: Convert to fraction form
    78,871.09/108,759.24 = 51,979.20/x
  3. Step 3: Cross multiply
    78,871.09x = 108,759.24 × 51,979.20
  4. Step 4: Simplify right side
    78,871.09x = 5,653,218,287.81
  5. Step 5: Solve for x
    x = 5,653,218,287.81/78,871.09
  6. Step 6: Final answer
    x = 71,676.69

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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.