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Finding the Fourth Proportional to 449.52, 675 and 420.72

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Solution

The fourth proportional to 449.52, 675 and 420.72 is: 631.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    449.52 : 675 = 420.72 : x
  2. Step 2: Convert to fraction form
    449.52/675 = 420.72/x
  3. Step 3: Cross multiply
    449.52x = 675 × 420.72
  4. Step 4: Simplify right side
    449.52x = 283,986
  5. Step 5: Solve for x
    x = 283,986/449.52
  6. Step 6: Final answer
    x = 631.75

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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.