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Finding the Fourth Proportional to 311.61, 429.80 and 201.13

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Solution

The fourth proportional to 311.61, 429.80 and 201.13 is: 277.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.61 : 429.80 = 201.13 : x
  2. Step 2: Convert to fraction form
    311.61/429.80 = 201.13/x
  3. Step 3: Cross multiply
    311.61x = 429.80 × 201.13
  4. Step 4: Simplify right side
    311.61x = 86,445.10
  5. Step 5: Solve for x
    x = 86,445.10/311.61
  6. Step 6: Final answer
    x = 277.41

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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.