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Finding the Fourth Proportional to 3,412, 5,118 and 980

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Solution

The fourth proportional to 3,412, 5,118 and 980 is: 1,470

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,412 : 5,118 = 980 : x
  2. Step 2: Convert to fraction form
    3,412/5,118 = 980/x
  3. Step 3: Cross multiply
    3,412x = 5,118 × 980
  4. Step 4: Simplify right side
    3,412x = 5,015,640
  5. Step 5: Solve for x
    x = 5,015,640/3,412
  6. Step 6: Final answer
    x = 1,470

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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.