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Finding the Fourth Proportional to 428.13, 641.39 and 341.56

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Solution

The fourth proportional to 428.13, 641.39 and 341.56 is: 511.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    428.13 : 641.39 = 341.56 : x
  2. Step 2: Convert to fraction form
    428.13/641.39 = 341.56/x
  3. Step 3: Cross multiply
    428.13x = 641.39 × 341.56
  4. Step 4: Simplify right side
    428.13x = 219,073.17
  5. Step 5: Solve for x
    x = 219,073.17/428.13
  6. Step 6: Final answer
    x = 511.70

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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.