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Finding the Fourth Proportional to 71,693.86, 107,540.55 and 18,385.78

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Solution

The fourth proportional to 71,693.86, 107,540.55 and 18,385.78 is: 27,578.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,693.86 : 107,540.55 = 18,385.78 : x
  2. Step 2: Convert to fraction form
    71,693.86/107,540.55 = 18,385.78/x
  3. Step 3: Cross multiply
    71,693.86x = 107,540.55 × 18,385.78
  4. Step 4: Simplify right side
    71,693.86x = 1,977,216,893.38
  5. Step 5: Solve for x
    x = 1,977,216,893.38/71,693.86
  6. Step 6: Final answer
    x = 27,578.61

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1.5x scale

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.