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Finding the Fourth Proportional to 312.19, 430.86 and 195.73

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Solution

The fourth proportional to 312.19, 430.86 and 195.73 is: 270.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.19 : 430.86 = 195.73 : x
  2. Step 2: Convert to fraction form
    312.19/430.86 = 195.73/x
  3. Step 3: Cross multiply
    312.19x = 430.86 × 195.73
  4. Step 4: Simplify right side
    312.19x = 84,332.23
  5. Step 5: Solve for x
    x = 84,332.23/312.19
  6. Step 6: Final answer
    x = 270.13

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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.