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Finding the Fourth Proportional to 1,959.32, 2,939 and 661.70

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Solution

The fourth proportional to 1,959.32, 2,939 and 661.70 is: 992.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,959.32 : 2,939 = 661.70 : x
  2. Step 2: Convert to fraction form
    1,959.32/2,939 = 661.70/x
  3. Step 3: Cross multiply
    1,959.32x = 2,939 × 661.70
  4. Step 4: Simplify right side
    1,959.32x = 1,944,736.30
  5. Step 5: Solve for x
    x = 1,944,736.30/1,959.32
  6. Step 6: Final answer
    x = 992.56

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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.