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Finding the Fourth Proportional to 317.96, 476.45 and 220.65

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Solution

The fourth proportional to 317.96, 476.45 and 220.65 is: 330.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    317.96 : 476.45 = 220.65 : x
  2. Step 2: Convert to fraction form
    317.96/476.45 = 220.65/x
  3. Step 3: Cross multiply
    317.96x = 476.45 × 220.65
  4. Step 4: Simplify right side
    317.96x = 105,129.01
  5. Step 5: Solve for x
    x = 105,129.01/317.96
  6. Step 6: Final answer
    x = 330.63

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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.