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Finding the Fourth Proportional to 278.61, 384.27 and 168.12

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Solution

The fourth proportional to 278.61, 384.27 and 168.12 is: 231.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.61 : 384.27 = 168.12 : x
  2. Step 2: Convert to fraction form
    278.61/384.27 = 168.12/x
  3. Step 3: Cross multiply
    278.61x = 384.27 × 168.12
  4. Step 4: Simplify right side
    278.61x = 64,603.47
  5. Step 5: Solve for x
    x = 64,603.47/278.61
  6. Step 6: Final answer
    x = 231.88

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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.