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Finding the Fourth Proportional to 1,959.79, 2,939.70 and 661.27

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Solution

The fourth proportional to 1,959.79, 2,939.70 and 661.27 is: 991.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,959.79 : 2,939.70 = 661.27 : x
  2. Step 2: Convert to fraction form
    1,959.79/2,939.70 = 661.27/x
  3. Step 3: Cross multiply
    1,959.79x = 2,939.70 × 661.27
  4. Step 4: Simplify right side
    1,959.79x = 1,943,935.42
  5. Step 5: Solve for x
    x = 1,943,935.42/1,959.79
  6. Step 6: Final answer
    x = 991.91

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1.5x scale

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.