Home / 78,538.23-108,448.16-72,839.79

Finding the Fourth Proportional to 78,538.23, 108,448.16 and 72,839.79

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Solution

The fourth proportional to 78,538.23, 108,448.16 and 72,839.79 is: 100,579.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,538.23 : 108,448.16 = 72,839.79 : x
  2. Step 2: Convert to fraction form
    78,538.23/108,448.16 = 72,839.79/x
  3. Step 3: Cross multiply
    78,538.23x = 108,448.16 × 72,839.79
  4. Step 4: Simplify right side
    78,538.23x = 7,899,340,836.09
  5. Step 5: Solve for x
    x = 7,899,340,836.09/78,538.23
  6. Step 6: Final answer
    x = 100,579.56

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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.