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Finding the Fourth Proportional to 79,290.30, 118,939.56 and 20,126.55

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Solution

The fourth proportional to 79,290.30, 118,939.56 and 20,126.55 is: 30,190.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,290.30 : 118,939.56 = 20,126.55 : x
  2. Step 2: Convert to fraction form
    79,290.30/118,939.56 = 20,126.55/x
  3. Step 3: Cross multiply
    79,290.30x = 118,939.56 × 20,126.55
  4. Step 4: Simplify right side
    79,290.30x = 2,393,843,001.32
  5. Step 5: Solve for x
    x = 2,393,843,001.32/79,290.30
  6. Step 6: Final answer
    x = 30,190.87

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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.