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Finding the Fourth Proportional to 139,295.63, 208,978.79 and 64,469.66

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Solution

The fourth proportional to 139,295.63, 208,978.79 and 64,469.66 is: 96,720.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,295.63 : 208,978.79 = 64,469.66 : x
  2. Step 2: Convert to fraction form
    139,295.63/208,978.79 = 64,469.66/x
  3. Step 3: Cross multiply
    139,295.63x = 208,978.79 × 64,469.66
  4. Step 4: Simplify right side
    139,295.63x = 13,472,790,171.27
  5. Step 5: Solve for x
    x = 13,472,790,171.27/139,295.63
  6. Step 6: Final answer
    x = 96,720.84

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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.