Home / 1,979.02-2,731.23-1,139.80

Finding the Fourth Proportional to 1,979.02, 2,731.23 and 1,139.80

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Solution

The fourth proportional to 1,979.02, 2,731.23 and 1,139.80 is: 1,573.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,979.02 : 2,731.23 = 1,139.80 : x
  2. Step 2: Convert to fraction form
    1,979.02/2,731.23 = 1,139.80/x
  3. Step 3: Cross multiply
    1,979.02x = 2,731.23 × 1,139.80
  4. Step 4: Simplify right side
    1,979.02x = 3,113,055.95
  5. Step 5: Solve for x
    x = 3,113,055.95/1,979.02
  6. Step 6: Final answer
    x = 1,573.03

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.