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Finding the Fourth Proportional to 311.61, 429.90 and 187.22

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Solution

The fourth proportional to 311.61, 429.90 and 187.22 is: 258.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.61 : 429.90 = 187.22 : x
  2. Step 2: Convert to fraction form
    311.61/429.90 = 187.22/x
  3. Step 3: Cross multiply
    311.61x = 429.90 × 187.22
  4. Step 4: Simplify right side
    311.61x = 80,486.25
  5. Step 5: Solve for x
    x = 80,486.25/311.61
  6. Step 6: Final answer
    x = 258.29

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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.