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Finding the Fourth Proportional to 399.52, 551.40 and 266.74

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Solution

The fourth proportional to 399.52, 551.40 and 266.74 is: 368.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.52 : 551.40 = 266.74 : x
  2. Step 2: Convert to fraction form
    399.52/551.40 = 266.74/x
  3. Step 3: Cross multiply
    399.52x = 551.40 × 266.74
  4. Step 4: Simplify right side
    399.52x = 147,080.44
  5. Step 5: Solve for x
    x = 147,080.44/399.52
  6. Step 6: Final answer
    x = 368.14

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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.