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Finding the Fourth Proportional to 454.80, 682.31 and 211.50

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Solution

The fourth proportional to 454.80, 682.31 and 211.50 is: 317.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    454.80 : 682.31 = 211.50 : x
  2. Step 2: Convert to fraction form
    454.80/682.31 = 211.50/x
  3. Step 3: Cross multiply
    454.80x = 682.31 × 211.50
  4. Step 4: Simplify right side
    454.80x = 144,308.57
  5. Step 5: Solve for x
    x = 144,308.57/454.80
  6. Step 6: Final answer
    x = 317.30

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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.