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Finding the Fourth Proportional to 379.20, 522.94 and 290.64

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Solution

The fourth proportional to 379.20, 522.94 and 290.64 is: 400.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    379.20 : 522.94 = 290.64 : x
  2. Step 2: Convert to fraction form
    379.20/522.94 = 290.64/x
  3. Step 3: Cross multiply
    379.20x = 522.94 × 290.64
  4. Step 4: Simplify right side
    379.20x = 151,987.28
  5. Step 5: Solve for x
    x = 151,987.28/379.20
  6. Step 6: Final answer
    x = 400.81

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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.