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Finding the Fourth Proportional to 378.55, 522.07 and 316.21

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Solution

The fourth proportional to 378.55, 522.07 and 316.21 is: 436.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    378.55 : 522.07 = 316.21 : x
  2. Step 2: Convert to fraction form
    378.55/522.07 = 316.21/x
  3. Step 3: Cross multiply
    378.55x = 522.07 × 316.21
  4. Step 4: Simplify right side
    378.55x = 165,083.75
  5. Step 5: Solve for x
    x = 165,083.75/378.55
  6. Step 6: Final answer
    x = 436.09

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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.