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Finding the Fourth Proportional to 278.98, 385 and 154.66

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Solution

The fourth proportional to 278.98, 385 and 154.66 is: 213.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.98 : 385 = 154.66 : x
  2. Step 2: Convert to fraction form
    278.98/385 = 154.66/x
  3. Step 3: Cross multiply
    278.98x = 385 × 154.66
  4. Step 4: Simplify right side
    278.98x = 59,544.10
  5. Step 5: Solve for x
    x = 59,544.10/278.98
  6. Step 6: Final answer
    x = 213.44

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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.