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Finding the Fourth Proportional to 399.21, 551.27 and 283.53

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Solution

The fourth proportional to 399.21, 551.27 and 283.53 is: 391.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.21 : 551.27 = 283.53 : x
  2. Step 2: Convert to fraction form
    399.21/551.27 = 283.53/x
  3. Step 3: Cross multiply
    399.21x = 551.27 × 283.53
  4. Step 4: Simplify right side
    399.21x = 156,300.17
  5. Step 5: Solve for x
    x = 156,300.17/399.21
  6. Step 6: Final answer
    x = 391.52

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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.