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Finding the Fourth Proportional to 279.79, 386.09 and 155.44

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Solution

The fourth proportional to 279.79, 386.09 and 155.44 is: 214.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.79 : 386.09 = 155.44 : x
  2. Step 2: Convert to fraction form
    279.79/386.09 = 155.44/x
  3. Step 3: Cross multiply
    279.79x = 386.09 × 155.44
  4. Step 4: Simplify right side
    279.79x = 60,014.12
  5. Step 5: Solve for x
    x = 60,014.12/279.79
  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.