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Finding the Fourth Proportional to 288.13, 396.81 and 287.23

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Solution

The fourth proportional to 288.13, 396.81 and 287.23 is: 395.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.13 : 396.81 = 287.23 : x
  2. Step 2: Convert to fraction form
    288.13/396.81 = 287.23/x
  3. Step 3: Cross multiply
    288.13x = 396.81 × 287.23
  4. Step 4: Simplify right side
    288.13x = 113,975.74
  5. Step 5: Solve for x
    x = 113,975.74/288.13
  6. Step 6: Final answer
    x = 395.57

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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.