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Finding the Fourth Proportional to 375.86, 518.76 and 287.20

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Solution

The fourth proportional to 375.86, 518.76 and 287.20 is: 396.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    375.86 : 518.76 = 287.20 : x
  2. Step 2: Convert to fraction form
    375.86/518.76 = 287.20/x
  3. Step 3: Cross multiply
    375.86x = 518.76 × 287.20
  4. Step 4: Simplify right side
    375.86x = 148,983.84
  5. Step 5: Solve for x
    x = 148,983.84/375.86
  6. Step 6: Final answer
    x = 396.38

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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.