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Finding the Fourth Proportional to 67,117.72, 100,676.90 and 20,371

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Solution

The fourth proportional to 67,117.72, 100,676.90 and 20,371 is: 30,556.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    67,117.72 : 100,676.90 = 20,371 : x
  2. Step 2: Convert to fraction form
    67,117.72/100,676.90 = 20,371/x
  3. Step 3: Cross multiply
    67,117.72x = 100,676.90 × 20,371
  4. Step 4: Simplify right side
    67,117.72x = 2,050,889,129.90
  5. Step 5: Solve for x
    x = 2,050,889,129.90/67,117.72
  6. Step 6: Final answer
    x = 30,556.60

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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.