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Finding the Fourth Proportional to 375.30, 518.31 and 287.10

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Solution

The fourth proportional to 375.30, 518.31 and 287.10 is: 396.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    375.30 : 518.31 = 287.10 : x
  2. Step 2: Convert to fraction form
    375.30/518.31 = 287.10/x
  3. Step 3: Cross multiply
    375.30x = 518.31 × 287.10
  4. Step 4: Simplify right side
    375.30x = 148,806.80
  5. Step 5: Solve for x
    x = 148,806.80/375.30
  6. Step 6: Final answer
    x = 396.50

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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.