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Finding the Fourth Proportional to 312.50, 433.28 and 311.16

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Solution

The fourth proportional to 312.50, 433.28 and 311.16 is: 431.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.50 : 433.28 = 311.16 : x
  2. Step 2: Convert to fraction form
    312.50/433.28 = 311.16/x
  3. Step 3: Cross multiply
    312.50x = 433.28 × 311.16
  4. Step 4: Simplify right side
    312.50x = 134,819.40
  5. Step 5: Solve for x
    x = 134,819.40/312.50
  6. Step 6: Final answer
    x = 431.42

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.