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Finding the Fourth Proportional to 139,067.70, 208,601.55 and 85,923.60

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Solution

The fourth proportional to 139,067.70, 208,601.55 and 85,923.60 is: 128,885.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,067.70 : 208,601.55 = 85,923.60 : x
  2. Step 2: Convert to fraction form
    139,067.70/208,601.55 = 85,923.60/x
  3. Step 3: Cross multiply
    139,067.70x = 208,601.55 × 85,923.60
  4. Step 4: Simplify right side
    139,067.70x = 17,923,796,141.58
  5. Step 5: Solve for x
    x = 17,923,796,141.58/139,067.70
  6. Step 6: Final answer
    x = 128,885.40

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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.