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Finding the Fourth Proportional to 378.32, 522.12 and 247.40

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Solution

The fourth proportional to 378.32, 522.12 and 247.40 is: 341.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    378.32 : 522.12 = 247.40 : x
  2. Step 2: Convert to fraction form
    378.32/522.12 = 247.40/x
  3. Step 3: Cross multiply
    378.32x = 522.12 × 247.40
  4. Step 4: Simplify right side
    378.32x = 129,172.49
  5. Step 5: Solve for x
    x = 129,172.49/378.32
  6. Step 6: Final answer
    x = 341.44

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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.