Home / 1,959.15-2,939.20-660.72

Finding the Fourth Proportional to 1,959.15, 2,939.20 and 660.72

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Solution

The fourth proportional to 1,959.15, 2,939.20 and 660.72 is: 991.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,959.15 : 2,939.20 = 660.72 : x
  2. Step 2: Convert to fraction form
    1,959.15/2,939.20 = 660.72/x
  3. Step 3: Cross multiply
    1,959.15x = 2,939.20 × 660.72
  4. Step 4: Simplify right side
    1,959.15x = 1,942,001.31
  5. Step 5: Solve for x
    x = 1,942,001.31/1,959.15
  6. Step 6: Final answer
    x = 991.24

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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.