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Finding the Fourth Proportional to 399.50, 551.39 and 261.74

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Solution

The fourth proportional to 399.50, 551.39 and 261.74 is: 361.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.50 : 551.39 = 261.74 : x
  2. Step 2: Convert to fraction form
    399.50/551.39 = 261.74/x
  3. Step 3: Cross multiply
    399.50x = 551.39 × 261.74
  4. Step 4: Simplify right side
    399.50x = 144,320.82
  5. Step 5: Solve for x
    x = 144,320.82/399.50
  6. Step 6: Final answer
    x = 361.25

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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.