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Finding the Fourth Proportional to 278.94, 384.95 and 154.61

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Solution

The fourth proportional to 278.94, 384.95 and 154.61 is: 213.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.94 : 384.95 = 154.61 : x
  2. Step 2: Convert to fraction form
    278.94/384.95 = 154.61/x
  3. Step 3: Cross multiply
    278.94x = 384.95 × 154.61
  4. Step 4: Simplify right side
    278.94x = 59,517.02
  5. Step 5: Solve for x
    x = 59,517.02/278.94
  6. Step 6: Final answer
    x = 213.37

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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.