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Finding the Fourth Proportional to 428,414.20, 642,621.30 and 251,121.40

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Solution

The fourth proportional to 428,414.20, 642,621.30 and 251,121.40 is: 376,682.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,414.20 : 642,621.30 = 251,121.40 : x
  2. Step 2: Convert to fraction form
    428,414.20/642,621.30 = 251,121.40/x
  3. Step 3: Cross multiply
    428,414.20x = 642,621.30 × 251,121.40
  4. Step 4: Simplify right side
    428,414.20x = 161,375,960,525.82
  5. Step 5: Solve for x
    x = 161,375,960,525.82/428,414.20
  6. Step 6: Final answer
    x = 376,682.10

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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.