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Finding the Fourth Proportional to 78,891.80, 118,424.10 and 43,899.80

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Solution

The fourth proportional to 78,891.80, 118,424.10 and 43,899.80 is: 65,897.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,891.80 : 118,424.10 = 43,899.80 : x
  2. Step 2: Convert to fraction form
    78,891.80/118,424.10 = 43,899.80/x
  3. Step 3: Cross multiply
    78,891.80x = 118,424.10 × 43,899.80
  4. Step 4: Simplify right side
    78,891.80x = 5,198,794,305.18
  5. Step 5: Solve for x
    x = 5,198,794,305.18/78,891.80
  6. Step 6: Final answer
    x = 65,897.78

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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.