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Finding the Fourth Proportional to 215,687.10, 323,530.65 and 203,439.90

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Solution

The fourth proportional to 215,687.10, 323,530.65 and 203,439.90 is: 305,159.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    215,687.10 : 323,530.65 = 203,439.90 : x
  2. Step 2: Convert to fraction form
    215,687.10/323,530.65 = 203,439.90/x
  3. Step 3: Cross multiply
    215,687.10x = 323,530.65 × 203,439.90
  4. Step 4: Simplify right side
    215,687.10x = 65,819,043,082.94
  5. Step 5: Solve for x
    x = 65,819,043,082.94/215,687.10
  6. Step 6: Final answer
    x = 305,159.85

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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.