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Finding the Fourth Proportional to 351.50, 485.87 and 320.31

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Solution

The fourth proportional to 351.50, 485.87 and 320.31 is: 442.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    351.50 : 485.87 = 320.31 : x
  2. Step 2: Convert to fraction form
    351.50/485.87 = 320.31/x
  3. Step 3: Cross multiply
    351.50x = 485.87 × 320.31
  4. Step 4: Simplify right side
    351.50x = 155,627.42
  5. Step 5: Solve for x
    x = 155,627.42/351.50
  6. Step 6: Final answer
    x = 442.76

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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.