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Finding the Fourth Proportional to 399,380.34, 551,145.87 and 218,093.70

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Solution

The fourth proportional to 399,380.34, 551,145.87 and 218,093.70 is: 300,969.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,380.34 : 551,145.87 = 218,093.70 : x
  2. Step 2: Convert to fraction form
    399,380.34/551,145.87 = 218,093.70/x
  3. Step 3: Cross multiply
    399,380.34x = 551,145.87 × 218,093.70
  4. Step 4: Simplify right side
    399,380.34x = 120,201,442,028.02
  5. Step 5: Solve for x
    x = 120,201,442,028.02/399,380.34
  6. Step 6: Final answer
    x = 300,969.85

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.