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Finding the Fourth Proportional to 351.68, 485.15 and 211.80

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Solution

The fourth proportional to 351.68, 485.15 and 211.80 is: 292.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    351.68 : 485.15 = 211.80 : x
  2. Step 2: Convert to fraction form
    351.68/485.15 = 211.80/x
  3. Step 3: Cross multiply
    351.68x = 485.15 × 211.80
  4. Step 4: Simplify right side
    351.68x = 102,753.40
  5. Step 5: Solve for x
    x = 102,753.40/351.68
  6. Step 6: Final answer
    x = 292.18

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.