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Finding the Fourth Proportional to 2,119.65, 3,179.46 and 658.80

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Solution

The fourth proportional to 2,119.65, 3,179.46 and 658.80 is: 988.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,119.65 : 3,179.46 = 658.80 : x
  2. Step 2: Convert to fraction form
    2,119.65/3,179.46 = 658.80/x
  3. Step 3: Cross multiply
    2,119.65x = 3,179.46 × 658.80
  4. Step 4: Simplify right side
    2,119.65x = 2,094,628.25
  5. Step 5: Solve for x
    x = 2,094,628.25/2,119.65
  6. Step 6: Final answer
    x = 988.20

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.