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Finding the Fourth Proportional to 449.76, 620.52 and 391.44

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Solution

The fourth proportional to 449.76, 620.52 and 391.44 is: 540.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    449.76 : 620.52 = 391.44 : x
  2. Step 2: Convert to fraction form
    449.76/620.52 = 391.44/x
  3. Step 3: Cross multiply
    449.76x = 620.52 × 391.44
  4. Step 4: Simplify right side
    449.76x = 242,896.35
  5. Step 5: Solve for x
    x = 242,896.35/449.76
  6. Step 6: Final answer
    x = 540.06

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.