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Finding the Fourth Proportional to 279.96, 386.35 and 155.61

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Solution

The fourth proportional to 279.96, 386.35 and 155.61 is: 214.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.96 : 386.35 = 155.61 : x
  2. Step 2: Convert to fraction form
    279.96/386.35 = 155.61/x
  3. Step 3: Cross multiply
    279.96x = 386.35 × 155.61
  4. Step 4: Simplify right side
    279.96x = 60,119.15
  5. Step 5: Solve for x
    x = 60,119.15/279.96
  6. Step 6: Final answer
    x = 214.75

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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.