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Finding the Fourth Proportional to 72,511.88, 100,064.82 and 40,680.20

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Solution

The fourth proportional to 72,511.88, 100,064.82 and 40,680.20 is: 56,137.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,511.88 : 100,064.82 = 40,680.20 : x
  2. Step 2: Convert to fraction form
    72,511.88/100,064.82 = 40,680.20/x
  3. Step 3: Cross multiply
    72,511.88x = 100,064.82 × 40,680.20
  4. Step 4: Simplify right side
    72,511.88x = 4,070,656,890.56
  5. Step 5: Solve for x
    x = 4,070,656,890.56/72,511.88
  6. Step 6: Final answer
    x = 56,137.79

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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.