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Finding the Fourth Proportional to 399.45, 551.20 and 233.63

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Solution

The fourth proportional to 399.45, 551.20 and 233.63 is: 322.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.45 : 551.20 = 233.63 : x
  2. Step 2: Convert to fraction form
    399.45/551.20 = 233.63/x
  3. Step 3: Cross multiply
    399.45x = 551.20 × 233.63
  4. Step 4: Simplify right side
    399.45x = 128,779.42
  5. Step 5: Solve for x
    x = 128,779.42/399.45
  6. Step 6: Final answer
    x = 322.39

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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.