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Finding the Fourth Proportional to 78,092.92, 117,139.06 and 18,928.52

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Solution

The fourth proportional to 78,092.92, 117,139.06 and 18,928.52 is: 28,392.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,092.92 : 117,139.06 = 18,928.52 : x
  2. Step 2: Convert to fraction form
    78,092.92/117,139.06 = 18,928.52/x
  3. Step 3: Cross multiply
    78,092.92x = 117,139.06 × 18,928.52
  4. Step 4: Simplify right side
    78,092.92x = 2,217,269,039.99
  5. Step 5: Solve for x
    x = 2,217,269,039.99/78,092.92
  6. Step 6: Final answer
    x = 28,392.70

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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.