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Finding the Fourth Proportional to 121,245.57, 181,868.67 and 42,359.78

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Solution

The fourth proportional to 121,245.57, 181,868.67 and 42,359.78 is: 63,539.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,245.57 : 181,868.67 = 42,359.78 : x
  2. Step 2: Convert to fraction form
    121,245.57/181,868.67 = 42,359.78/x
  3. Step 3: Cross multiply
    121,245.57x = 181,868.67 × 42,359.78
  4. Step 4: Simplify right side
    121,245.57x = 7,703,915,940.75
  5. Step 5: Solve for x
    x = 7,703,915,940.75/121,245.57
  6. Step 6: Final answer
    x = 63,539.78

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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.