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Finding the Fourth Proportional to 312.26, 430.70 and 195.74

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Solution

The fourth proportional to 312.26, 430.70 and 195.74 is: 269.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.26 : 430.70 = 195.74 : x
  2. Step 2: Convert to fraction form
    312.26/430.70 = 195.74/x
  3. Step 3: Cross multiply
    312.26x = 430.70 × 195.74
  4. Step 4: Simplify right side
    312.26x = 84,305.22
  5. Step 5: Solve for x
    x = 84,305.22/312.26
  6. Step 6: Final answer
    x = 269.98

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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.