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Finding the Fourth Proportional to 279.23, 385.34 and 154.89

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Solution

The fourth proportional to 279.23, 385.34 and 154.89 is: 213.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.23 : 385.34 = 154.89 : x
  2. Step 2: Convert to fraction form
    279.23/385.34 = 154.89/x
  3. Step 3: Cross multiply
    279.23x = 385.34 × 154.89
  4. Step 4: Simplify right side
    279.23x = 59,684.54
  5. Step 5: Solve for x
    x = 59,684.54/279.23
  6. Step 6: Final answer
    x = 213.75

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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.