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Finding the Fourth Proportional to 352.07, 485.72 and 212.20

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Solution

The fourth proportional to 352.07, 485.72 and 212.20 is: 292.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    352.07 : 485.72 = 212.20 : x
  2. Step 2: Convert to fraction form
    352.07/485.72 = 212.20/x
  3. Step 3: Cross multiply
    352.07x = 485.72 × 212.20
  4. Step 4: Simplify right side
    352.07x = 103,069.78
  5. Step 5: Solve for x
    x = 103,069.78/352.07
  6. Step 6: Final answer
    x = 292.75

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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.