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Finding the Fourth Proportional to 71,808.48, 99,097.20 and 39,979.44

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Solution

The fourth proportional to 71,808.48, 99,097.20 and 39,979.44 is: 55,172.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,808.48 : 99,097.20 = 39,979.44 : x
  2. Step 2: Convert to fraction form
    71,808.48/99,097.20 = 39,979.44/x
  3. Step 3: Cross multiply
    71,808.48x = 99,097.20 × 39,979.44
  4. Step 4: Simplify right side
    71,808.48x = 3,961,850,561.57
  5. Step 5: Solve for x
    x = 3,961,850,561.57/71,808.48
  6. Step 6: Final answer
    x = 55,172.46

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.