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Finding the Fourth Proportional to 490, 676.20 and 283.04

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Solution

The fourth proportional to 490, 676.20 and 283.04 is: 390.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    490 : 676.20 = 283.04 : x
  2. Step 2: Convert to fraction form
    490/676.20 = 283.04/x
  3. Step 3: Cross multiply
    490x = 676.20 × 283.04
  4. Step 4: Simplify right side
    490x = 191,391.65
  5. Step 5: Solve for x
    x = 191,391.65/490
  6. Step 6: Final answer
    x = 390.60

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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.