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Finding the Fourth Proportional to 379.89, 524.25 and 281.79

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Solution

The fourth proportional to 379.89, 524.25 and 281.79 is: 388.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    379.89 : 524.25 = 281.79 : x
  2. Step 2: Convert to fraction form
    379.89/524.25 = 281.79/x
  3. Step 3: Cross multiply
    379.89x = 524.25 × 281.79
  4. Step 4: Simplify right side
    379.89x = 147,728.41
  5. Step 5: Solve for x
    x = 147,728.41/379.89
  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.