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Finding the Fourth Proportional to 449.84, 620.94 and 281.72

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Solution

The fourth proportional to 449.84, 620.94 and 281.72 is: 388.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    449.84 : 620.94 = 281.72 : x
  2. Step 2: Convert to fraction form
    449.84/620.94 = 281.72/x
  3. Step 3: Cross multiply
    449.84x = 620.94 × 281.72
  4. Step 4: Simplify right side
    449.84x = 174,931.22
  5. Step 5: Solve for x
    x = 174,931.22/449.84
  6. Step 6: Final answer
    x = 388.87

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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.