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Finding the Fourth Proportional to 312.70, 431.35 and 196.06

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Solution

The fourth proportional to 312.70, 431.35 and 196.06 is: 270.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.70 : 431.35 = 196.06 : x
  2. Step 2: Convert to fraction form
    312.70/431.35 = 196.06/x
  3. Step 3: Cross multiply
    312.70x = 431.35 × 196.06
  4. Step 4: Simplify right side
    312.70x = 84,570.48
  5. Step 5: Solve for x
    x = 84,570.48/312.70
  6. Step 6: Final answer
    x = 270.45

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