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Finding the Fourth Proportional to 288, 399.57 and 285.30

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Solution

The fourth proportional to 288, 399.57 and 285.30 is: 395.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    288 : 399.57 = 285.30 : x
  2. Step 2: Convert to fraction form
    288/399.57 = 285.30/x
  3. Step 3: Cross multiply
    288x = 399.57 × 285.30
  4. Step 4: Simplify right side
    288x = 113,997.32
  5. Step 5: Solve for x
    x = 113,997.32/288
  6. Step 6: Final answer
    x = 395.82

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.