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Finding the Fourth Proportional to 78,070.92, 117,105.84 and 18,906.90

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Solution

The fourth proportional to 78,070.92, 117,105.84 and 18,906.90 is: 28,360.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,070.92 : 117,105.84 = 18,906.90 : x
  2. Step 2: Convert to fraction form
    78,070.92/117,105.84 = 18,906.90/x
  3. Step 3: Cross multiply
    78,070.92x = 117,105.84 × 18,906.90
  4. Step 4: Simplify right side
    78,070.92x = 2,214,108,406.30
  5. Step 5: Solve for x
    x = 2,214,108,406.30/78,070.92
  6. Step 6: Final answer
    x = 28,360.22

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1.5x scale

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.