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Finding the Fourth Proportional to 312.78, 429.30 and 273.90

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Solution

The fourth proportional to 312.78, 429.30 and 273.90 is: 375.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.78 : 429.30 = 273.90 : x
  2. Step 2: Convert to fraction form
    312.78/429.30 = 273.90/x
  3. Step 3: Cross multiply
    312.78x = 429.30 × 273.90
  4. Step 4: Simplify right side
    312.78x = 117,585.27
  5. Step 5: Solve for x
    x = 117,585.27/312.78
  6. Step 6: Final answer
    x = 375.94

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.