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Finding the Fourth Proportional to 1,959.96, 2,939.60 and 661.40

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Solution

The fourth proportional to 1,959.96, 2,939.60 and 661.40 is: 991.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,959.96 : 2,939.60 = 661.40 : x
  2. Step 2: Convert to fraction form
    1,959.96/2,939.60 = 661.40/x
  3. Step 3: Cross multiply
    1,959.96x = 2,939.60 × 661.40
  4. Step 4: Simplify right side
    1,959.96x = 1,944,251.44
  5. Step 5: Solve for x
    x = 1,944,251.44/1,959.96
  6. Step 6: Final answer
    x = 991.99

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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.