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Finding the Fourth Proportional to 81,269.46, 121,793.47 and 39,146.48

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Solution

The fourth proportional to 81,269.46, 121,793.47 and 39,146.48 is: 58,666.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,269.46 : 121,793.47 = 39,146.48 : x
  2. Step 2: Convert to fraction form
    81,269.46/121,793.47 = 39,146.48/x
  3. Step 3: Cross multiply
    81,269.46x = 121,793.47 × 39,146.48
  4. Step 4: Simplify right side
    81,269.46x = 4,767,784,930.65
  5. Step 5: Solve for x
    x = 4,767,784,930.65/81,269.46
  6. Step 6: Final answer
    x = 58,666.38

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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.