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Finding the Fourth Proportional to 278.91, 384.84 and 191.61

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Solution

The fourth proportional to 278.91, 384.84 and 191.61 is: 264.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.91 : 384.84 = 191.61 : x
  2. Step 2: Convert to fraction form
    278.91/384.84 = 191.61/x
  3. Step 3: Cross multiply
    278.91x = 384.84 × 191.61
  4. Step 4: Simplify right side
    278.91x = 73,739.19
  5. Step 5: Solve for x
    x = 73,739.19/278.91
  6. Step 6: Final answer
    x = 264.38

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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.