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Finding the Fourth Proportional to 351.20, 527.70 and 311.60

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Solution

The fourth proportional to 351.20, 527.70 and 311.60 is: 468.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    351.20 : 527.70 = 311.60 : x
  2. Step 2: Convert to fraction form
    351.20/527.70 = 311.60/x
  3. Step 3: Cross multiply
    351.20x = 527.70 × 311.60
  4. Step 4: Simplify right side
    351.20x = 164,431.32
  5. Step 5: Solve for x
    x = 164,431.32/351.20
  6. Step 6: Final answer
    x = 468.20

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.