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Finding the Fourth Proportional to 81,589.12, 122,369.12 and 51,918.88

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Solution

The fourth proportional to 81,589.12, 122,369.12 and 51,918.88 is: 77,869.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,589.12 : 122,369.12 = 51,918.88 : x
  2. Step 2: Convert to fraction form
    81,589.12/122,369.12 = 51,918.88/x
  3. Step 3: Cross multiply
    81,589.12x = 122,369.12 × 51,918.88
  4. Step 4: Simplify right side
    81,589.12x = 6,353,267,656.99
  5. Step 5: Solve for x
    x = 6,353,267,656.99/81,589.12
  6. Step 6: Final answer
    x = 77,869.05

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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.