Home / 78,338.20-117,584.10-38,939.80

Finding the Fourth Proportional to 78,338.20, 117,584.10 and 38,939.80

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Solution

The fourth proportional to 78,338.20, 117,584.10 and 38,939.80 is: 58,447.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,338.20 : 117,584.10 = 38,939.80 : x
  2. Step 2: Convert to fraction form
    78,338.20/117,584.10 = 38,939.80/x
  3. Step 3: Cross multiply
    78,338.20x = 117,584.10 × 38,939.80
  4. Step 4: Simplify right side
    78,338.20x = 4,578,701,337.18
  5. Step 5: Solve for x
    x = 4,578,701,337.18/78,338.20
  6. Step 6: Final answer
    x = 58,447.88

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.