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Finding the Fourth Proportional to 71,129.80, 98,161.97 and 40,915.11

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Solution

The fourth proportional to 71,129.80, 98,161.97 and 40,915.11 is: 56,464.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,129.80 : 98,161.97 = 40,915.11 : x
  2. Step 2: Convert to fraction form
    71,129.80/98,161.97 = 40,915.11/x
  3. Step 3: Cross multiply
    71,129.80x = 98,161.97 × 40,915.11
  4. Step 4: Simplify right side
    71,129.80x = 4,016,307,800.37
  5. Step 5: Solve for x
    x = 4,016,307,800.37/71,129.80
  6. Step 6: Final answer
    x = 56,464.49

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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.