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Finding the Fourth Proportional to 1,959.31, 2,939.01 and 660.77

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Solution

The fourth proportional to 1,959.31, 2,939.01 and 660.77 is: 991.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,959.31 : 2,939.01 = 660.77 : x
  2. Step 2: Convert to fraction form
    1,959.31/2,939.01 = 660.77/x
  3. Step 3: Cross multiply
    1,959.31x = 2,939.01 × 660.77
  4. Step 4: Simplify right side
    1,959.31x = 1,942,016.99
  5. Step 5: Solve for x
    x = 1,942,016.99/1,959.31
  6. Step 6: Final answer
    x = 991.18

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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.