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Finding the Fourth Proportional to 288.70, 399 and 230.38

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Solution

The fourth proportional to 288.70, 399 and 230.38 is: 318.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.70 : 399 = 230.38 : x
  2. Step 2: Convert to fraction form
    288.70/399 = 230.38/x
  3. Step 3: Cross multiply
    288.70x = 399 × 230.38
  4. Step 4: Simplify right side
    288.70x = 91,921.62
  5. Step 5: Solve for x
    x = 91,921.62/288.70
  6. Step 6: Final answer
    x = 318.40

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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.