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Finding the Fourth Proportional to 488.79, 674.55 and 279

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Solution

The fourth proportional to 488.79, 674.55 and 279 is: 385.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    488.79 : 674.55 = 279 : x
  2. Step 2: Convert to fraction form
    488.79/674.55 = 279/x
  3. Step 3: Cross multiply
    488.79x = 674.55 × 279
  4. Step 4: Simplify right side
    488.79x = 188,199.45
  5. Step 5: Solve for x
    x = 188,199.45/488.79
  6. Step 6: Final answer
    x = 385.03

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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.