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Finding the Fourth Proportional to 399.67, 551.80 and 250.35

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Solution

The fourth proportional to 399.67, 551.80 and 250.35 is: 345.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.67 : 551.80 = 250.35 : x
  2. Step 2: Convert to fraction form
    399.67/551.80 = 250.35/x
  3. Step 3: Cross multiply
    399.67x = 551.80 × 250.35
  4. Step 4: Simplify right side
    399.67x = 138,143.13
  5. Step 5: Solve for x
    x = 138,143.13/399.67
  6. Step 6: Final answer
    x = 345.64

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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.