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Finding the Fourth Proportional to 449.76, 620.67 and 253.32

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Solution

The fourth proportional to 449.76, 620.67 and 253.32 is: 349.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    449.76 : 620.67 = 253.32 : x
  2. Step 2: Convert to fraction form
    449.76/620.67 = 253.32/x
  3. Step 3: Cross multiply
    449.76x = 620.67 × 253.32
  4. Step 4: Simplify right side
    449.76x = 157,228.12
  5. Step 5: Solve for x
    x = 157,228.12/449.76
  6. Step 6: Final answer
    x = 349.58

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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.