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Finding the Fourth Proportional to 317.46, 476.54 and 221.70

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Solution

The fourth proportional to 317.46, 476.54 and 221.70 is: 332.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    317.46 : 476.54 = 221.70 : x
  2. Step 2: Convert to fraction form
    317.46/476.54 = 221.70/x
  3. Step 3: Cross multiply
    317.46x = 476.54 × 221.70
  4. Step 4: Simplify right side
    317.46x = 105,648.92
  5. Step 5: Solve for x
    x = 105,648.92/317.46
  6. Step 6: Final answer
    x = 332.79

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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.