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Finding the Fourth Proportional to 78,092.22, 117,137.28 and 18,928.40

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Solution

The fourth proportional to 78,092.22, 117,137.28 and 18,928.40 is: 28,392.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,092.22 : 117,137.28 = 18,928.40 : x
  2. Step 2: Convert to fraction form
    78,092.22/117,137.28 = 18,928.40/x
  3. Step 3: Cross multiply
    78,092.22x = 117,137.28 × 18,928.40
  4. Step 4: Simplify right side
    78,092.22x = 2,217,221,290.75
  5. Step 5: Solve for x
    x = 2,217,221,290.75/78,092.22
  6. Step 6: Final answer
    x = 28,392.35

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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.