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Finding the Fourth Proportional to 278.45, 384.25 and 154.11

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Solution

The fourth proportional to 278.45, 384.25 and 154.11 is: 212.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.45 : 384.25 = 154.11 : x
  2. Step 2: Convert to fraction form
    278.45/384.25 = 154.11/x
  3. Step 3: Cross multiply
    278.45x = 384.25 × 154.11
  4. Step 4: Simplify right side
    278.45x = 59,217.46
  5. Step 5: Solve for x
    x = 59,217.46/278.45
  6. Step 6: Final answer
    x = 212.66

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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.