Home / 1,980.89-2,735.79-1,320.55

Finding the Fourth Proportional to 1,980.89, 2,735.79 and 1,320.55

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Solution

The fourth proportional to 1,980.89, 2,735.79 and 1,320.55 is: 1,823.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,980.89 : 2,735.79 = 1,320.55 : x
  2. Step 2: Convert to fraction form
    1,980.89/2,735.79 = 1,320.55/x
  3. Step 3: Cross multiply
    1,980.89x = 2,735.79 × 1,320.55
  4. Step 4: Simplify right side
    1,980.89x = 3,612,747.48
  5. Step 5: Solve for x
    x = 3,612,747.48/1,980.89
  6. Step 6: Final answer
    x = 1,823.80

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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.