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Finding the Fourth Proportional to 1,981.56, 2,735.10 and 1,318.80

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Solution

The fourth proportional to 1,981.56, 2,735.10 and 1,318.80 is: 1,820.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,981.56 : 2,735.10 = 1,318.80 : x
  2. Step 2: Convert to fraction form
    1,981.56/2,735.10 = 1,318.80/x
  3. Step 3: Cross multiply
    1,981.56x = 2,735.10 × 1,318.80
  4. Step 4: Simplify right side
    1,981.56x = 3,607,049.88
  5. Step 5: Solve for x
    x = 3,607,049.88/1,981.56
  6. Step 6: Final answer
    x = 1,820.31

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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.