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Finding the Fourth Proportional to 311.35, 429.30 and 228.48

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Solution

The fourth proportional to 311.35, 429.30 and 228.48 is: 315.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.35 : 429.30 = 228.48 : x
  2. Step 2: Convert to fraction form
    311.35/429.30 = 228.48/x
  3. Step 3: Cross multiply
    311.35x = 429.30 × 228.48
  4. Step 4: Simplify right side
    311.35x = 98,086.46
  5. Step 5: Solve for x
    x = 98,086.46/311.35
  6. Step 6: Final answer
    x = 315.04

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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.