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Finding the Fourth Proportional to 78,398.80, 117,511.80 and 43,363.60

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Solution

The fourth proportional to 78,398.80, 117,511.80 and 43,363.60 is: 64,997.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,398.80 : 117,511.80 = 43,363.60 : x
  2. Step 2: Convert to fraction form
    78,398.80/117,511.80 = 43,363.60/x
  3. Step 3: Cross multiply
    78,398.80x = 117,511.80 × 43,363.60
  4. Step 4: Simplify right side
    78,398.80x = 5,095,734,690.48
  5. Step 5: Solve for x
    x = 5,095,734,690.48/78,398.80
  6. Step 6: Final answer
    x = 64,997.61

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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.