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Finding the Fourth Proportional to 380.48, 525.04 and 287.20

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Solution

The fourth proportional to 380.48, 525.04 and 287.20 is: 396.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    380.48 : 525.04 = 287.20 : x
  2. Step 2: Convert to fraction form
    380.48/525.04 = 287.20/x
  3. Step 3: Cross multiply
    380.48x = 525.04 × 287.20
  4. Step 4: Simplify right side
    380.48x = 150,791.49
  5. Step 5: Solve for x
    x = 150,791.49/380.48
  6. Step 6: Final answer
    x = 396.32

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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.