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Finding the Fourth Proportional to 317.85, 476 and 220.09

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Solution

The fourth proportional to 317.85, 476 and 220.09 is: 329.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    317.85 : 476 = 220.09 : x
  2. Step 2: Convert to fraction form
    317.85/476 = 220.09/x
  3. Step 3: Cross multiply
    317.85x = 476 × 220.09
  4. Step 4: Simplify right side
    317.85x = 104,762.84
  5. Step 5: Solve for x
    x = 104,762.84/317.85
  6. Step 6: Final answer
    x = 329.60

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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.