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Finding the Fourth Proportional to 278.89, 384.88 and 168.39

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Solution

The fourth proportional to 278.89, 384.88 and 168.39 is: 232.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.89 : 384.88 = 168.39 : x
  2. Step 2: Convert to fraction form
    278.89/384.88 = 168.39/x
  3. Step 3: Cross multiply
    278.89x = 384.88 × 168.39
  4. Step 4: Simplify right side
    278.89x = 64,809.94
  5. Step 5: Solve for x
    x = 64,809.94/278.89
  6. Step 6: Final answer
    x = 232.39

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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.