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Finding the Fourth Proportional to 422.45, 631.99 and 356.71

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Solution

The fourth proportional to 422.45, 631.99 and 356.71 is: 533.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    422.45 : 631.99 = 356.71 : x
  2. Step 2: Convert to fraction form
    422.45/631.99 = 356.71/x
  3. Step 3: Cross multiply
    422.45x = 631.99 × 356.71
  4. Step 4: Simplify right side
    422.45x = 225,437.15
  5. Step 5: Solve for x
    x = 225,437.15/422.45
  6. Step 6: Final answer
    x = 533.64

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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.