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Finding the Fourth Proportional to 1,959.68, 2,939.96 and 661.08

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Solution

The fourth proportional to 1,959.68, 2,939.96 and 661.08 is: 991.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,959.68 : 2,939.96 = 661.08 : x
  2. Step 2: Convert to fraction form
    1,959.68/2,939.96 = 661.08/x
  3. Step 3: Cross multiply
    1,959.68x = 2,939.96 × 661.08
  4. Step 4: Simplify right side
    1,959.68x = 1,943,548.76
  5. Step 5: Solve for x
    x = 1,943,548.76/1,959.68
  6. Step 6: Final answer
    x = 991.77

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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.