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Finding the Fourth Proportional to 279.86, 386.17 and 155.48

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Solution

The fourth proportional to 279.86, 386.17 and 155.48 is: 214.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.86 : 386.17 = 155.48 : x
  2. Step 2: Convert to fraction form
    279.86/386.17 = 155.48/x
  3. Step 3: Cross multiply
    279.86x = 386.17 × 155.48
  4. Step 4: Simplify right side
    279.86x = 60,040.93
  5. Step 5: Solve for x
    x = 60,040.93/279.86
  6. Step 6: Final answer
    x = 214.54

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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.