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Finding the Fourth Proportional to 445.83, 668.21 and 211.70

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Solution

The fourth proportional to 445.83, 668.21 and 211.70 is: 317.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    445.83 : 668.21 = 211.70 : x
  2. Step 2: Convert to fraction form
    445.83/668.21 = 211.70/x
  3. Step 3: Cross multiply
    445.83x = 668.21 × 211.70
  4. Step 4: Simplify right side
    445.83x = 141,458.16
  5. Step 5: Solve for x
    x = 141,458.16/445.83
  6. Step 6: Final answer
    x = 317.29

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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.