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Finding the Fourth Proportional to 278.89, 384.86 and 154.54

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Solution

The fourth proportional to 278.89, 384.86 and 154.54 is: 213.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.89 : 384.86 = 154.54 : x
  2. Step 2: Convert to fraction form
    278.89/384.86 = 154.54/x
  3. Step 3: Cross multiply
    278.89x = 384.86 × 154.54
  4. Step 4: Simplify right side
    278.89x = 59,476.26
  5. Step 5: Solve for x
    x = 59,476.26/278.89
  6. Step 6: Final answer
    x = 213.26

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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.