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Finding the Fourth Proportional to 137,723.70, 206,585.55 and 78,674.70

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Solution

The fourth proportional to 137,723.70, 206,585.55 and 78,674.70 is: 118,012.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    137,723.70 : 206,585.55 = 78,674.70 : x
  2. Step 2: Convert to fraction form
    137,723.70/206,585.55 = 78,674.70/x
  3. Step 3: Cross multiply
    137,723.70x = 206,585.55 × 78,674.70
  4. Step 4: Simplify right side
    137,723.70x = 16,253,056,170.59
  5. Step 5: Solve for x
    x = 16,253,056,170.59/137,723.70
  6. Step 6: Final answer
    x = 118,012.05

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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.