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Finding the Fourth Proportional to 53,561.60, 80,428.80 and 40,428.80

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Solution

The fourth proportional to 53,561.60, 80,428.80 and 40,428.80 is: 60,708.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    53,561.60 : 80,428.80 = 40,428.80 : x
  2. Step 2: Convert to fraction form
    53,561.60/80,428.80 = 40,428.80/x
  3. Step 3: Cross multiply
    53,561.60x = 80,428.80 × 40,428.80
  4. Step 4: Simplify right side
    53,561.60x = 3,251,639,869.44
  5. Step 5: Solve for x
    x = 3,251,639,869.44/53,561.60
  6. Step 6: Final answer
    x = 60,708.42

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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.