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Finding the Fourth Proportional to 71,679.41, 98,940.65 and 43,408.79

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Solution

The fourth proportional to 71,679.41, 98,940.65 and 43,408.79 is: 59,918.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,679.41 : 98,940.65 = 43,408.79 : x
  2. Step 2: Convert to fraction form
    71,679.41/98,940.65 = 43,408.79/x
  3. Step 3: Cross multiply
    71,679.41x = 98,940.65 × 43,408.79
  4. Step 4: Simplify right side
    71,679.41x = 4,294,893,898.31
  5. Step 5: Solve for x
    x = 4,294,893,898.31/71,679.41
  6. Step 6: Final answer
    x = 59,918.10

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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.