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Finding the Fourth Proportional to 399.76, 551.86 and 267.21

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Solution

The fourth proportional to 399.76, 551.86 and 267.21 is: 368.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.76 : 551.86 = 267.21 : x
  2. Step 2: Convert to fraction form
    399.76/551.86 = 267.21/x
  3. Step 3: Cross multiply
    399.76x = 551.86 × 267.21
  4. Step 4: Simplify right side
    399.76x = 147,462.51
  5. Step 5: Solve for x
    x = 147,462.51/399.76
  6. Step 6: Final answer
    x = 368.88

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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.