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Finding the Fourth Proportional to 1,986.36, 2,980.20 and 1,255.08

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Solution

The fourth proportional to 1,986.36, 2,980.20 and 1,255.08 is: 1,883.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,986.36 : 2,980.20 = 1,255.08 : x
  2. Step 2: Convert to fraction form
    1,986.36/2,980.20 = 1,255.08/x
  3. Step 3: Cross multiply
    1,986.36x = 2,980.20 × 1,255.08
  4. Step 4: Simplify right side
    1,986.36x = 3,740,389.42
  5. Step 5: Solve for x
    x = 3,740,389.42/1,986.36
  6. Step 6: Final answer
    x = 1,883.04

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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.