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Finding the Fourth Proportional to 288.50, 398.66 and 227.07

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Solution

The fourth proportional to 288.50, 398.66 and 227.07 is: 313.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.50 : 398.66 = 227.07 : x
  2. Step 2: Convert to fraction form
    288.50/398.66 = 227.07/x
  3. Step 3: Cross multiply
    288.50x = 398.66 × 227.07
  4. Step 4: Simplify right side
    288.50x = 90,522.59
  5. Step 5: Solve for x
    x = 90,522.59/288.50
  6. Step 6: Final answer
    x = 313.78

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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.