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Finding the Fourth Proportional to 312.20, 468.38 and 129.50

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Solution

The fourth proportional to 312.20, 468.38 and 129.50 is: 194.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.20 : 468.38 = 129.50 : x
  2. Step 2: Convert to fraction form
    312.20/468.38 = 129.50/x
  3. Step 3: Cross multiply
    312.20x = 468.38 × 129.50
  4. Step 4: Simplify right side
    312.20x = 60,654.95
  5. Step 5: Solve for x
    x = 60,654.95/312.20
  6. Step 6: Final answer
    x = 194.28

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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.