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Finding the Fourth Proportional to 311.69, 429.93 and 201.30

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Solution

The fourth proportional to 311.69, 429.93 and 201.30 is: 277.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.69 : 429.93 = 201.30 : x
  2. Step 2: Convert to fraction form
    311.69/429.93 = 201.30/x
  3. Step 3: Cross multiply
    311.69x = 429.93 × 201.30
  4. Step 4: Simplify right side
    311.69x = 86,544.91
  5. Step 5: Solve for x
    x = 86,544.91/311.69
  6. Step 6: Final answer
    x = 277.66

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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.