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Finding the Fourth Proportional to 399.89, 551.24 and 281.50

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Solution

The fourth proportional to 399.89, 551.24 and 281.50 is: 388.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.89 : 551.24 = 281.50 : x
  2. Step 2: Convert to fraction form
    399.89/551.24 = 281.50/x
  3. Step 3: Cross multiply
    399.89x = 551.24 × 281.50
  4. Step 4: Simplify right side
    399.89x = 155,174.06
  5. Step 5: Solve for x
    x = 155,174.06/399.89
  6. Step 6: Final answer
    x = 388.04

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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.