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Finding the Fourth Proportional to 288.63, 397.51 and 287.75

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Solution

The fourth proportional to 288.63, 397.51 and 287.75 is: 396.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.63 : 397.51 = 287.75 : x
  2. Step 2: Convert to fraction form
    288.63/397.51 = 287.75/x
  3. Step 3: Cross multiply
    288.63x = 397.51 × 287.75
  4. Step 4: Simplify right side
    288.63x = 114,383.78
  5. Step 5: Solve for x
    x = 114,383.78/288.63
  6. Step 6: Final answer
    x = 396.30

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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.