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Finding the Fourth Proportional to 378.40, 522 and 291.04

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Solution

The fourth proportional to 378.40, 522 and 291.04 is: 401.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    378.40 : 522 = 291.04 : x
  2. Step 2: Convert to fraction form
    378.40/522 = 291.04/x
  3. Step 3: Cross multiply
    378.40x = 522 × 291.04
  4. Step 4: Simplify right side
    378.40x = 151,922.88
  5. Step 5: Solve for x
    x = 151,922.88/378.40
  6. Step 6: Final answer
    x = 401.49

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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.