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Finding the Fourth Proportional to 311.34, 429.58 and 211.80

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Solution

The fourth proportional to 311.34, 429.58 and 211.80 is: 292.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.34 : 429.58 = 211.80 : x
  2. Step 2: Convert to fraction form
    311.34/429.58 = 211.80/x
  3. Step 3: Cross multiply
    311.34x = 429.58 × 211.80
  4. Step 4: Simplify right side
    311.34x = 90,985.04
  5. Step 5: Solve for x
    x = 90,985.04/311.34
  6. Step 6: Final answer
    x = 292.24

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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.