Home / 78,679.20-108,578.10-42,869.81

Finding the Fourth Proportional to 78,679.20, 108,578.10 and 42,869.81

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Solution

The fourth proportional to 78,679.20, 108,578.10 and 42,869.81 is: 59,160.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,679.20 : 108,578.10 = 42,869.81 : x
  2. Step 2: Convert to fraction form
    78,679.20/108,578.10 = 42,869.81/x
  3. Step 3: Cross multiply
    78,679.20x = 108,578.10 × 42,869.81
  4. Step 4: Simplify right side
    78,679.20x = 4,654,722,302.81
  5. Step 5: Solve for x
    x = 4,654,722,302.81/78,679.20
  6. Step 6: Final answer
    x = 59,160.77

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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.