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Finding the Fourth Proportional to 311.44, 429.64 and 187.12

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Solution

The fourth proportional to 311.44, 429.64 and 187.12 is: 258.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.44 : 429.64 = 187.12 : x
  2. Step 2: Convert to fraction form
    311.44/429.64 = 187.12/x
  3. Step 3: Cross multiply
    311.44x = 429.64 × 187.12
  4. Step 4: Simplify right side
    311.44x = 80,394.24
  5. Step 5: Solve for x
    x = 80,394.24/311.44
  6. Step 6: Final answer
    x = 258.14

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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.