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Finding the Fourth Proportional to 67,310.88, 100,981.16 and 20,567.40

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Solution

The fourth proportional to 67,310.88, 100,981.16 and 20,567.40 is: 30,855.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    67,310.88 : 100,981.16 = 20,567.40 : x
  2. Step 2: Convert to fraction form
    67,310.88/100,981.16 = 20,567.40/x
  3. Step 3: Cross multiply
    67,310.88x = 100,981.16 × 20,567.40
  4. Step 4: Simplify right side
    67,310.88x = 2,076,919,910.18
  5. Step 5: Solve for x
    x = 2,076,919,910.18/67,310.88
  6. Step 6: Final answer
    x = 30,855.63

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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.