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Finding the Fourth Proportional to 80,728.48, 121,087.80 and 38,638.48

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Solution

The fourth proportional to 80,728.48, 121,087.80 and 38,638.48 is: 57,955.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,728.48 : 121,087.80 = 38,638.48 : x
  2. Step 2: Convert to fraction form
    80,728.48/121,087.80 = 38,638.48/x
  3. Step 3: Cross multiply
    80,728.48x = 121,087.80 × 38,638.48
  4. Step 4: Simplify right side
    80,728.48x = 4,678,648,538.54
  5. Step 5: Solve for x
    x = 4,678,648,538.54/80,728.48
  6. Step 6: Final answer
    x = 57,955.37

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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.