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Finding the Fourth Proportional to 279.16, 385.21 and 154.79

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Solution

The fourth proportional to 279.16, 385.21 and 154.79 is: 213.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.16 : 385.21 = 154.79 : x
  2. Step 2: Convert to fraction form
    279.16/385.21 = 154.79/x
  3. Step 3: Cross multiply
    279.16x = 385.21 × 154.79
  4. Step 4: Simplify right side
    279.16x = 59,626.66
  5. Step 5: Solve for x
    x = 59,626.66/279.16
  6. Step 6: Final answer
    x = 213.59

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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.