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Finding the Fourth Proportional to 449.72, 678.93 and 447.28

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Solution

The fourth proportional to 449.72, 678.93 and 447.28 is: 675.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    449.72 : 678.93 = 447.28 : x
  2. Step 2: Convert to fraction form
    449.72/678.93 = 447.28/x
  3. Step 3: Cross multiply
    449.72x = 678.93 × 447.28
  4. Step 4: Simplify right side
    449.72x = 303,671.81
  5. Step 5: Solve for x
    x = 303,671.81/449.72
  6. Step 6: Final answer
    x = 675.25

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.