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Finding the Fourth Proportional to 137,905.40, 206,858.10 and 128,063.90

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Solution

The fourth proportional to 137,905.40, 206,858.10 and 128,063.90 is: 192,095.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    137,905.40 : 206,858.10 = 128,063.90 : x
  2. Step 2: Convert to fraction form
    137,905.40/206,858.10 = 128,063.90/x
  3. Step 3: Cross multiply
    137,905.40x = 206,858.10 × 128,063.90
  4. Step 4: Simplify right side
    137,905.40x = 26,491,055,032.59
  5. Step 5: Solve for x
    x = 26,491,055,032.59/137,905.40
  6. Step 6: Final answer
    x = 192,095.85

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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.