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Finding the Fourth Proportional to 312.39, 468.20 and 138.86

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Solution

The fourth proportional to 312.39, 468.20 and 138.86 is: 208.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.39 : 468.20 = 138.86 : x
  2. Step 2: Convert to fraction form
    312.39/468.20 = 138.86/x
  3. Step 3: Cross multiply
    312.39x = 468.20 × 138.86
  4. Step 4: Simplify right side
    312.39x = 65,014.25
  5. Step 5: Solve for x
    x = 65,014.25/312.39
  6. Step 6: Final answer
    x = 208.12

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.