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Finding the Fourth Proportional to 139,634.78, 207,872.75 and 138,804.40

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Solution

The fourth proportional to 139,634.78, 207,872.75 and 138,804.40 is: 206,636.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,634.78 : 207,872.75 = 138,804.40 : x
  2. Step 2: Convert to fraction form
    139,634.78/207,872.75 = 138,804.40/x
  3. Step 3: Cross multiply
    139,634.78x = 207,872.75 × 138,804.40
  4. Step 4: Simplify right side
    139,634.78x = 28,853,652,340.10
  5. Step 5: Solve for x
    x = 28,853,652,340.10/139,634.78
  6. Step 6: Final answer
    x = 206,636.57

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.