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Finding the Fourth Proportional to 399.77, 551.15 and 281.59

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Solution

The fourth proportional to 399.77, 551.15 and 281.59 is: 388.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.77 : 551.15 = 281.59 : x
  2. Step 2: Convert to fraction form
    399.77/551.15 = 281.59/x
  3. Step 3: Cross multiply
    399.77x = 551.15 × 281.59
  4. Step 4: Simplify right side
    399.77x = 155,198.33
  5. Step 5: Solve for x
    x = 155,198.33/399.77
  6. Step 6: Final answer
    x = 388.22

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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.