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Finding the Fourth Proportional to 78,331.85, 117,494.13 and 19,164.39

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Solution

The fourth proportional to 78,331.85, 117,494.13 and 19,164.39 is: 28,745.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,331.85 : 117,494.13 = 19,164.39 : x
  2. Step 2: Convert to fraction form
    78,331.85/117,494.13 = 19,164.39/x
  3. Step 3: Cross multiply
    78,331.85x = 117,494.13 × 19,164.39
  4. Step 4: Simplify right side
    78,331.85x = 2,251,703,330.03
  5. Step 5: Solve for x
    x = 2,251,703,330.03/78,331.85
  6. Step 6: Final answer
    x = 28,745.69

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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.