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Finding the Fourth Proportional to 399.85, 551.74 and 222.81

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Solution

The fourth proportional to 399.85, 551.74 and 222.81 is: 307.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.85 : 551.74 = 222.81 : x
  2. Step 2: Convert to fraction form
    399.85/551.74 = 222.81/x
  3. Step 3: Cross multiply
    399.85x = 551.74 × 222.81
  4. Step 4: Simplify right side
    399.85x = 122,933.19
  5. Step 5: Solve for x
    x = 122,933.19/399.85
  6. Step 6: Final answer
    x = 307.45

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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.