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Finding the Fourth Proportional to 318.22, 438.78 and 269.02

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Solution

The fourth proportional to 318.22, 438.78 and 269.02 is: 370.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.22 : 438.78 = 269.02 : x
  2. Step 2: Convert to fraction form
    318.22/438.78 = 269.02/x
  3. Step 3: Cross multiply
    318.22x = 438.78 × 269.02
  4. Step 4: Simplify right side
    318.22x = 118,040.60
  5. Step 5: Solve for x
    x = 118,040.60/318.22
  6. Step 6: Final answer
    x = 370.94

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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.