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Finding the Fourth Proportional to 311.34, 429.61 and 187.02

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Solution

The fourth proportional to 311.34, 429.61 and 187.02 is: 258.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.34 : 429.61 = 187.02 : x
  2. Step 2: Convert to fraction form
    311.34/429.61 = 187.02/x
  3. Step 3: Cross multiply
    311.34x = 429.61 × 187.02
  4. Step 4: Simplify right side
    311.34x = 80,346.35
  5. Step 5: Solve for x
    x = 80,346.35/311.34
  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.