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Finding the Fourth Proportional to 378.53, 522.35 and 212.77

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Solution

The fourth proportional to 378.53, 522.35 and 212.77 is: 293.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    378.53 : 522.35 = 212.77 : x
  2. Step 2: Convert to fraction form
    378.53/522.35 = 212.77/x
  3. Step 3: Cross multiply
    378.53x = 522.35 × 212.77
  4. Step 4: Simplify right side
    378.53x = 111,142.20
  5. Step 5: Solve for x
    x = 111,142.20/378.53
  6. Step 6: Final answer
    x = 293.61

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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.