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Finding the Fourth Proportional to 84,561.20, 126,841.80 and 80,673.20

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Solution

The fourth proportional to 84,561.20, 126,841.80 and 80,673.20 is: 121,009.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,561.20 : 126,841.80 = 80,673.20 : x
  2. Step 2: Convert to fraction form
    84,561.20/126,841.80 = 80,673.20/x
  3. Step 3: Cross multiply
    84,561.20x = 126,841.80 × 80,673.20
  4. Step 4: Simplify right side
    84,561.20x = 10,232,733,899.76
  5. Step 5: Solve for x
    x = 10,232,733,899.76/84,561.20
  6. Step 6: Final answer
    x = 121,009.80

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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.