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Finding the Fourth Proportional to 4,986, 7,479 and 1,338

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Solution

The fourth proportional to 4,986, 7,479 and 1,338 is: 2,007

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,986 : 7,479 = 1,338 : x
  2. Step 2: Convert to fraction form
    4,986/7,479 = 1,338/x
  3. Step 3: Cross multiply
    4,986x = 7,479 × 1,338
  4. Step 4: Simplify right side
    4,986x = 10,006,902
  5. Step 5: Solve for x
    x = 10,006,902/4,986
  6. Step 6: Final answer
    x = 2,007

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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.