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Finding the Fourth Proportional to 378.30, 522.45 and 290.10

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Solution

The fourth proportional to 378.30, 522.45 and 290.10 is: 400.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    378.30 : 522.45 = 290.10 : x
  2. Step 2: Convert to fraction form
    378.30/522.45 = 290.10/x
  3. Step 3: Cross multiply
    378.30x = 522.45 × 290.10
  4. Step 4: Simplify right side
    378.30x = 151,562.75
  5. Step 5: Solve for x
    x = 151,562.75/378.30
  6. Step 6: Final answer
    x = 400.64

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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.