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Finding the Fourth Proportional to 279.78, 386.09 and 155.44

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Solution

The fourth proportional to 279.78, 386.09 and 155.44 is: 214.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.78 : 386.09 = 155.44 : x
  2. Step 2: Convert to fraction form
    279.78/386.09 = 155.44/x
  3. Step 3: Cross multiply
    279.78x = 386.09 × 155.44
  4. Step 4: Simplify right side
    279.78x = 60,012.93
  5. Step 5: Solve for x
    x = 60,012.93/279.78
  6. Step 6: Final answer
    x = 214.50

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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.