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Finding the Fourth Proportional to 246.78, 340.60 and 143.28

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Solution

The fourth proportional to 246.78, 340.60 and 143.28 is: 197.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    246.78 : 340.60 = 143.28 : x
  2. Step 2: Convert to fraction form
    246.78/340.60 = 143.28/x
  3. Step 3: Cross multiply
    246.78x = 340.60 × 143.28
  4. Step 4: Simplify right side
    246.78x = 48,801.17
  5. Step 5: Solve for x
    x = 48,801.17/246.78
  6. Step 6: Final answer
    x = 197.75

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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.