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Finding the Fourth Proportional to 81,231.40, 121,847.10 and 70,863.40

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Solution

The fourth proportional to 81,231.40, 121,847.10 and 70,863.40 is: 106,295.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,231.40 : 121,847.10 = 70,863.40 : x
  2. Step 2: Convert to fraction form
    81,231.40/121,847.10 = 70,863.40/x
  3. Step 3: Cross multiply
    81,231.40x = 121,847.10 × 70,863.40
  4. Step 4: Simplify right side
    81,231.40x = 8,634,499,786.14
  5. Step 5: Solve for x
    x = 8,634,499,786.14/81,231.40
  6. Step 6: Final answer
    x = 106,295.10

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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.