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Finding the Fourth Proportional to 137,910.40, 206,865.60 and 128,068.90

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Solution

The fourth proportional to 137,910.40, 206,865.60 and 128,068.90 is: 192,103.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    137,910.40 : 206,865.60 = 128,068.90 : x
  2. Step 2: Convert to fraction form
    137,910.40/206,865.60 = 128,068.90/x
  3. Step 3: Cross multiply
    137,910.40x = 206,865.60 × 128,068.90
  4. Step 4: Simplify right side
    137,910.40x = 26,493,049,839.84
  5. Step 5: Solve for x
    x = 26,493,049,839.84/137,910.40
  6. Step 6: Final answer
    x = 192,103.35

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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.