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Finding the Fourth Proportional to 3,613.09, 5,420.00 and 980.64

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Solution

The fourth proportional to 3,613.09, 5,420.00 and 980.64 is: 1,471.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,613.09 : 5,420.00 = 980.64 : x
  2. Step 2: Convert to fraction form
    3,613.09/5,420.00 = 980.64/x
  3. Step 3: Cross multiply
    3,613.09x = 5,420.00 × 980.64
  4. Step 4: Simplify right side
    3,613.09x = 5,315,067.57
  5. Step 5: Solve for x
    x = 5,315,067.57/3,613.09
  6. Step 6: Final answer
    x = 1,471.06

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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.