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Finding the Fourth Proportional to 71,589.96, 107,389.98 and 18,999

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Solution

The fourth proportional to 71,589.96, 107,389.98 and 18,999 is: 28,499.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,589.96 : 107,389.98 = 18,999 : x
  2. Step 2: Convert to fraction form
    71,589.96/107,389.98 = 18,999/x
  3. Step 3: Cross multiply
    71,589.96x = 107,389.98 × 18,999
  4. Step 4: Simplify right side
    71,589.96x = 2,040,302,230.02
  5. Step 5: Solve for x
    x = 2,040,302,230.02/71,589.96
  6. Step 6: Final answer
    x = 28,499.84

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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.