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Finding the Fourth Proportional to 81,315.80, 121,811.70 and 71,574.20

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Solution

The fourth proportional to 81,315.80, 121,811.70 and 71,574.20 is: 107,218.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,315.80 : 121,811.70 = 71,574.20 : x
  2. Step 2: Convert to fraction form
    81,315.80/121,811.70 = 71,574.20/x
  3. Step 3: Cross multiply
    81,315.80x = 121,811.70 × 71,574.20
  4. Step 4: Simplify right side
    81,315.80x = 8,718,574,978.14
  5. Step 5: Solve for x
    x = 8,718,574,978.14/81,315.80
  6. Step 6: Final answer
    x = 107,218.71

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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.