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Finding the Fourth Proportional to 318.20, 438.90 and 262.86

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Solution

The fourth proportional to 318.20, 438.90 and 262.86 is: 362.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.20 : 438.90 = 262.86 : x
  2. Step 2: Convert to fraction form
    318.20/438.90 = 262.86/x
  3. Step 3: Cross multiply
    318.20x = 438.90 × 262.86
  4. Step 4: Simplify right side
    318.20x = 115,369.25
  5. Step 5: Solve for x
    x = 115,369.25/318.20
  6. Step 6: Final answer
    x = 362.57

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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.