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Finding the Fourth Proportional to 423.70, 636.24 and 355.78

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Solution

The fourth proportional to 423.70, 636.24 and 355.78 is: 534.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    423.70 : 636.24 = 355.78 : x
  2. Step 2: Convert to fraction form
    423.70/636.24 = 355.78/x
  3. Step 3: Cross multiply
    423.70x = 636.24 × 355.78
  4. Step 4: Simplify right side
    423.70x = 226,361.47
  5. Step 5: Solve for x
    x = 226,361.47/423.70
  6. Step 6: Final answer
    x = 534.25

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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.