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Finding the Fourth Proportional to 312.26, 430.62 and 195.80

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Solution

The fourth proportional to 312.26, 430.62 and 195.80 is: 270.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.26 : 430.62 = 195.80 : x
  2. Step 2: Convert to fraction form
    312.26/430.62 = 195.80/x
  3. Step 3: Cross multiply
    312.26x = 430.62 × 195.80
  4. Step 4: Simplify right side
    312.26x = 84,315.40
  5. Step 5: Solve for x
    x = 84,315.40/312.26
  6. Step 6: Final answer
    x = 270.02

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.