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Finding the Fourth Proportional to 137,879.10, 206,818.65 and 90,639.90

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Solution

The fourth proportional to 137,879.10, 206,818.65 and 90,639.90 is: 135,959.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    137,879.10 : 206,818.65 = 90,639.90 : x
  2. Step 2: Convert to fraction form
    137,879.10/206,818.65 = 90,639.90/x
  3. Step 3: Cross multiply
    137,879.10x = 206,818.65 × 90,639.90
  4. Step 4: Simplify right side
    137,879.10x = 18,746,021,754.14
  5. Step 5: Solve for x
    x = 18,746,021,754.14/137,879.10
  6. Step 6: Final answer
    x = 135,959.85

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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.