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Finding the Fourth Proportional to 488.65, 674.25 and 278.86

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Solution

The fourth proportional to 488.65, 674.25 and 278.86 is: 384.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    488.65 : 674.25 = 278.86 : x
  2. Step 2: Convert to fraction form
    488.65/674.25 = 278.86/x
  3. Step 3: Cross multiply
    488.65x = 674.25 × 278.86
  4. Step 4: Simplify right side
    488.65x = 188,021.36
  5. Step 5: Solve for x
    x = 188,021.36/488.65
  6. Step 6: Final answer
    x = 384.78

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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.