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Finding the Fourth Proportional to 81,284.88, 112,211.48 and 61,149.43

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Solution

The fourth proportional to 81,284.88, 112,211.48 and 61,149.43 is: 84,415.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,284.88 : 112,211.48 = 61,149.43 : x
  2. Step 2: Convert to fraction form
    81,284.88/112,211.48 = 61,149.43/x
  3. Step 3: Cross multiply
    81,284.88x = 112,211.48 × 61,149.43
  4. Step 4: Simplify right side
    81,284.88x = 6,861,667,913.80
  5. Step 5: Solve for x
    x = 6,861,667,913.80/81,284.88
  6. Step 6: Final answer
    x = 84,415.06

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.