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Finding the Fourth Proportional to 138,791.91, 208,156.71 and 63,840.06

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Solution

The fourth proportional to 138,791.91, 208,156.71 and 63,840.06 is: 95,745.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,791.91 : 208,156.71 = 63,840.06 : x
  2. Step 2: Convert to fraction form
    138,791.91/208,156.71 = 63,840.06/x
  3. Step 3: Cross multiply
    138,791.91x = 208,156.71 × 63,840.06
  4. Step 4: Simplify right side
    138,791.91x = 13,288,736,855.80
  5. Step 5: Solve for x
    x = 13,288,736,855.80/138,791.91
  6. Step 6: Final answer
    x = 95,745.76

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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.