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Finding the Fourth Proportional to 311.38, 429.58 and 187.06

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Solution

The fourth proportional to 311.38, 429.58 and 187.06 is: 258.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.38 : 429.58 = 187.06 : x
  2. Step 2: Convert to fraction form
    311.38/429.58 = 187.06/x
  3. Step 3: Cross multiply
    311.38x = 429.58 × 187.06
  4. Step 4: Simplify right side
    311.38x = 80,357.23
  5. Step 5: Solve for x
    x = 80,357.23/311.38
  6. Step 6: Final answer
    x = 258.07

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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.