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Finding the Fourth Proportional to 206,493.80, 309,740.70 and 81,818.60

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Solution

The fourth proportional to 206,493.80, 309,740.70 and 81,818.60 is: 122,727.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    206,493.80 : 309,740.70 = 81,818.60 : x
  2. Step 2: Convert to fraction form
    206,493.80/309,740.70 = 81,818.60/x
  3. Step 3: Cross multiply
    206,493.80x = 309,740.70 × 81,818.60
  4. Step 4: Simplify right side
    206,493.80x = 25,342,550,437.02
  5. Step 5: Solve for x
    x = 25,342,550,437.02/206,493.80
  6. Step 6: Final answer
    x = 122,727.90

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1.5x scale

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.