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Finding the Fourth Proportional to 353.15, 487.10 and 213.21

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Solution

The fourth proportional to 353.15, 487.10 and 213.21 is: 294.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    353.15 : 487.10 = 213.21 : x
  2. Step 2: Convert to fraction form
    353.15/487.10 = 213.21/x
  3. Step 3: Cross multiply
    353.15x = 487.10 × 213.21
  4. Step 4: Simplify right side
    353.15x = 103,853.92
  5. Step 5: Solve for x
    x = 103,853.92/353.15
  6. Step 6: Final answer
    x = 294.08

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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.