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Finding the Fourth Proportional to 107,920.69, 148,979.12 and 79,189.58

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Solution

The fourth proportional to 107,920.69, 148,979.12 and 79,189.58 is: 109,317.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    107,920.69 : 148,979.12 = 79,189.58 : x
  2. Step 2: Convert to fraction form
    107,920.69/148,979.12 = 79,189.58/x
  3. Step 3: Cross multiply
    107,920.69x = 148,979.12 × 79,189.58
  4. Step 4: Simplify right side
    107,920.69x = 11,797,593,918.07
  5. Step 5: Solve for x
    x = 11,797,593,918.07/107,920.69
  6. Step 6: Final answer
    x = 109,317.26

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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.