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Finding the Fourth Proportional to 121,285.80, 181,928.70 and 91,542.60

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Solution

The fourth proportional to 121,285.80, 181,928.70 and 91,542.60 is: 137,313.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,285.80 : 181,928.70 = 91,542.60 : x
  2. Step 2: Convert to fraction form
    121,285.80/181,928.70 = 91,542.60/x
  3. Step 3: Cross multiply
    121,285.80x = 181,928.70 × 91,542.60
  4. Step 4: Simplify right side
    121,285.80x = 16,654,226,212.62
  5. Step 5: Solve for x
    x = 16,654,226,212.62/121,285.80
  6. Step 6: Final answer
    x = 137,313.90

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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.