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Finding the Fourth Proportional to 1,981.74, 2,973.21 and 665.34

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Solution

The fourth proportional to 1,981.74, 2,973.21 and 665.34 is: 998.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,981.74 : 2,973.21 = 665.34 : x
  2. Step 2: Convert to fraction form
    1,981.74/2,973.21 = 665.34/x
  3. Step 3: Cross multiply
    1,981.74x = 2,973.21 × 665.34
  4. Step 4: Simplify right side
    1,981.74x = 1,978,195.54
  5. Step 5: Solve for x
    x = 1,978,195.54/1,981.74
  6. Step 6: Final answer
    x = 998.21

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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.