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Finding the Fourth Proportional to 133,079.85, 199,619.78 and 85,840.65

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Solution

The fourth proportional to 133,079.85, 199,619.78 and 85,840.65 is: 128,760.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    133,079.85 : 199,619.78 = 85,840.65 : x
  2. Step 2: Convert to fraction form
    133,079.85/199,619.78 = 85,840.65/x
  3. Step 3: Cross multiply
    133,079.85x = 199,619.78 × 85,840.65
  4. Step 4: Simplify right side
    133,079.85x = 17,135,491,668.06
  5. Step 5: Solve for x
    x = 17,135,491,668.06/133,079.85
  6. Step 6: Final answer
    x = 128,760.98

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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.