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Finding the Fourth Proportional to 288.58, 398.21 and 229.72

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Solution

The fourth proportional to 288.58, 398.21 and 229.72 is: 316.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.58 : 398.21 = 229.72 : x
  2. Step 2: Convert to fraction form
    288.58/398.21 = 229.72/x
  3. Step 3: Cross multiply
    288.58x = 398.21 × 229.72
  4. Step 4: Simplify right side
    288.58x = 91,475.40
  5. Step 5: Solve for x
    x = 91,475.40/288.58
  6. Step 6: Final answer
    x = 316.99

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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.