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Finding the Fourth Proportional to 318.35, 438.72 and 229.67

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Solution

The fourth proportional to 318.35, 438.72 and 229.67 is: 316.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.35 : 438.72 = 229.67 : x
  2. Step 2: Convert to fraction form
    318.35/438.72 = 229.67/x
  3. Step 3: Cross multiply
    318.35x = 438.72 × 229.67
  4. Step 4: Simplify right side
    318.35x = 100,761.06
  5. Step 5: Solve for x
    x = 100,761.06/318.35
  6. Step 6: Final answer
    x = 316.52

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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.