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Finding the Fourth Proportional to 126,990.87, 190,486.31 and 42,743.98

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Solution

The fourth proportional to 126,990.87, 190,486.31 and 42,743.98 is: 64,115.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    126,990.87 : 190,486.31 = 42,743.98 : x
  2. Step 2: Convert to fraction form
    126,990.87/190,486.31 = 42,743.98/x
  3. Step 3: Cross multiply
    126,990.87x = 190,486.31 × 42,743.98
  4. Step 4: Simplify right side
    126,990.87x = 8,142,142,633.78
  5. Step 5: Solve for x
    x = 8,142,142,633.78/126,990.87
  6. Step 6: Final answer
    x = 64,115.97

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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.