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Finding the Fourth Proportional to 78,070.28, 117,105.15 and 18,905.90

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Solution

The fourth proportional to 78,070.28, 117,105.15 and 18,905.90 is: 28,358.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,070.28 : 117,105.15 = 18,905.90 : x
  2. Step 2: Convert to fraction form
    78,070.28/117,105.15 = 18,905.90/x
  3. Step 3: Cross multiply
    78,070.28x = 117,105.15 × 18,905.90
  4. Step 4: Simplify right side
    78,070.28x = 2,213,978,255.39
  5. Step 5: Solve for x
    x = 2,213,978,255.39/78,070.28
  6. Step 6: Final answer
    x = 28,358.78

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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.