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Finding the Fourth Proportional to 378.23, 521.97 and 212.47

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Solution

The fourth proportional to 378.23, 521.97 and 212.47 is: 293.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    378.23 : 521.97 = 212.47 : x
  2. Step 2: Convert to fraction form
    378.23/521.97 = 212.47/x
  3. Step 3: Cross multiply
    378.23x = 521.97 × 212.47
  4. Step 4: Simplify right side
    378.23x = 110,900.36
  5. Step 5: Solve for x
    x = 110,900.36/378.23
  6. Step 6: Final answer
    x = 293.21

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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.