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Finding the Fourth Proportional to 278.79, 384.84 and 191.76

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Solution

The fourth proportional to 278.79, 384.84 and 191.76 is: 264.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.79 : 384.84 = 191.76 : x
  2. Step 2: Convert to fraction form
    278.79/384.84 = 191.76/x
  3. Step 3: Cross multiply
    278.79x = 384.84 × 191.76
  4. Step 4: Simplify right side
    278.79x = 73,796.92
  5. Step 5: Solve for x
    x = 73,796.92/278.79
  6. Step 6: Final answer
    x = 264.70

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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.