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Finding the Fourth Proportional to 71,699.86, 107,549.55 and 18,391.78

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Solution

The fourth proportional to 71,699.86, 107,549.55 and 18,391.78 is: 27,587.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,699.86 : 107,549.55 = 18,391.78 : x
  2. Step 2: Convert to fraction form
    71,699.86/107,549.55 = 18,391.78/x
  3. Step 3: Cross multiply
    71,699.86x = 107,549.55 × 18,391.78
  4. Step 4: Simplify right side
    71,699.86x = 1,978,027,662.70
  5. Step 5: Solve for x
    x = 1,978,027,662.70/71,699.86
  6. Step 6: Final answer
    x = 27,587.61

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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.