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Finding the Fourth Proportional to 312, 467.69 and 129.50

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Solution

The fourth proportional to 312, 467.69 and 129.50 is: 194.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    312 : 467.69 = 129.50 : x
  2. Step 2: Convert to fraction form
    312/467.69 = 129.50/x
  3. Step 3: Cross multiply
    312x = 467.69 × 129.50
  4. Step 4: Simplify right side
    312x = 60,562.87
  5. Step 5: Solve for x
    x = 60,562.87/312
  6. Step 6: Final answer
    x = 194.11

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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.