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Finding the Fourth Proportional to 312.30, 468.66 and 138.96

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Solution

The fourth proportional to 312.30, 468.66 and 138.96 is: 208.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.30 : 468.66 = 138.96 : x
  2. Step 2: Convert to fraction form
    312.30/468.66 = 138.96/x
  3. Step 3: Cross multiply
    312.30x = 468.66 × 138.96
  4. Step 4: Simplify right side
    312.30x = 65,124.99
  5. Step 5: Solve for x
    x = 65,124.99/312.30
  6. Step 6: Final answer
    x = 208.53

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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.