Home / 1,979.56-2,731.89-1,140.39

Finding the Fourth Proportional to 1,979.56, 2,731.89 and 1,140.39

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Solution

The fourth proportional to 1,979.56, 2,731.89 and 1,140.39 is: 1,573.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,979.56 : 2,731.89 = 1,140.39 : x
  2. Step 2: Convert to fraction form
    1,979.56/2,731.89 = 1,140.39/x
  3. Step 3: Cross multiply
    1,979.56x = 2,731.89 × 1,140.39
  4. Step 4: Simplify right side
    1,979.56x = 3,115,430.28
  5. Step 5: Solve for x
    x = 3,115,430.28/1,979.56
  6. Step 6: Final answer
    x = 1,573.80

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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.