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Finding the Fourth Proportional to 1,976.56, 2,964.51 and 661.23

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Solution

The fourth proportional to 1,976.56, 2,964.51 and 661.23 is: 991.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,976.56 : 2,964.51 = 661.23 : x
  2. Step 2: Convert to fraction form
    1,976.56/2,964.51 = 661.23/x
  3. Step 3: Cross multiply
    1,976.56x = 2,964.51 × 661.23
  4. Step 4: Simplify right side
    1,976.56x = 1,960,222.95
  5. Step 5: Solve for x
    x = 1,960,222.95/1,976.56
  6. Step 6: Final answer
    x = 991.73

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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.