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Finding the Fourth Proportional to 378.12, 522.18 and 377.40

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Solution

The fourth proportional to 378.12, 522.18 and 377.40 is: 521.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    378.12 : 522.18 = 377.40 : x
  2. Step 2: Convert to fraction form
    378.12/522.18 = 377.40/x
  3. Step 3: Cross multiply
    378.12x = 522.18 × 377.40
  4. Step 4: Simplify right side
    378.12x = 197,070.73
  5. Step 5: Solve for x
    x = 197,070.73/378.12
  6. Step 6: Final answer
    x = 521.19

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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.