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Finding the Fourth Proportional to 80,718.48, 121,072.80 and 38,628.48

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Solution

The fourth proportional to 80,718.48, 121,072.80 and 38,628.48 is: 57,940.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,718.48 : 121,072.80 = 38,628.48 : x
  2. Step 2: Convert to fraction form
    80,718.48/121,072.80 = 38,628.48/x
  3. Step 3: Cross multiply
    80,718.48x = 121,072.80 × 38,628.48
  4. Step 4: Simplify right side
    80,718.48x = 4,676,858,233.34
  5. Step 5: Solve for x
    x = 4,676,858,233.34/80,718.48
  6. Step 6: Final answer
    x = 57,940.37

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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.