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Finding the Fourth Proportional to 312.10, 467.81 and 129.45

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Solution

The fourth proportional to 312.10, 467.81 and 129.45 is: 194.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.10 : 467.81 = 129.45 : x
  2. Step 2: Convert to fraction form
    312.10/467.81 = 129.45/x
  3. Step 3: Cross multiply
    312.10x = 467.81 × 129.45
  4. Step 4: Simplify right side
    312.10x = 60,558.00
  5. Step 5: Solve for x
    x = 60,558.00/312.10
  6. Step 6: Final answer
    x = 194.03

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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.