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Finding the Fourth Proportional to 1,980.21, 2,969.45 and 940.51

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Solution

The fourth proportional to 1,980.21, 2,969.45 and 940.51 is: 1,410.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,980.21 : 2,969.45 = 940.51 : x
  2. Step 2: Convert to fraction form
    1,980.21/2,969.45 = 940.51/x
  3. Step 3: Cross multiply
    1,980.21x = 2,969.45 × 940.51
  4. Step 4: Simplify right side
    1,980.21x = 2,792,797.42
  5. Step 5: Solve for x
    x = 2,792,797.42/1,980.21
  6. Step 6: Final answer
    x = 1,410.35

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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.