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Finding the Fourth Proportional to 378.08, 521.74 and 212.30

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Solution

The fourth proportional to 378.08, 521.74 and 212.30 is: 292.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    378.08 : 521.74 = 212.30 : x
  2. Step 2: Convert to fraction form
    378.08/521.74 = 212.30/x
  3. Step 3: Cross multiply
    378.08x = 521.74 × 212.30
  4. Step 4: Simplify right side
    378.08x = 110,765.40
  5. Step 5: Solve for x
    x = 110,765.40/378.08
  6. Step 6: Final answer
    x = 292.97

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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.