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Finding the Fourth Proportional to 353.12, 487.24 and 211.40

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Solution

The fourth proportional to 353.12, 487.24 and 211.40 is: 291.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    353.12 : 487.24 = 211.40 : x
  2. Step 2: Convert to fraction form
    353.12/487.24 = 211.40/x
  3. Step 3: Cross multiply
    353.12x = 487.24 × 211.40
  4. Step 4: Simplify right side
    353.12x = 103,002.54
  5. Step 5: Solve for x
    x = 103,002.54/353.12
  6. Step 6: Final answer
    x = 291.69

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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.