Home / 78,679.21-108,578.55-42,869.22

Finding the Fourth Proportional to 78,679.21, 108,578.55 and 42,869.22

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Solution

The fourth proportional to 78,679.21, 108,578.55 and 42,869.22 is: 59,160.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,679.21 : 108,578.55 = 42,869.22 : x
  2. Step 2: Convert to fraction form
    78,679.21/108,578.55 = 42,869.22/x
  3. Step 3: Cross multiply
    78,679.21x = 108,578.55 × 42,869.22
  4. Step 4: Simplify right side
    78,679.21x = 4,654,677,747.23
  5. Step 5: Solve for x
    x = 4,654,677,747.23/78,679.21
  6. Step 6: Final answer
    x = 59,160.20

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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.