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Finding the Fourth Proportional to 311.18, 429.50 and 256.50

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Solution

The fourth proportional to 311.18, 429.50 and 256.50 is: 354.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.18 : 429.50 = 256.50 : x
  2. Step 2: Convert to fraction form
    311.18/429.50 = 256.50/x
  3. Step 3: Cross multiply
    311.18x = 429.50 × 256.50
  4. Step 4: Simplify right side
    311.18x = 110,167.39
  5. Step 5: Solve for x
    x = 110,167.39/311.18
  6. Step 6: Final answer
    x = 354.04

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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.