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Finding the Fourth Proportional to 3,980.88, 5,971.19 and 1,209.47

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Solution

The fourth proportional to 3,980.88, 5,971.19 and 1,209.47 is: 1,814.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,980.88 : 5,971.19 = 1,209.47 : x
  2. Step 2: Convert to fraction form
    3,980.88/5,971.19 = 1,209.47/x
  3. Step 3: Cross multiply
    3,980.88x = 5,971.19 × 1,209.47
  4. Step 4: Simplify right side
    3,980.88x = 7,221,939.27
  5. Step 5: Solve for x
    x = 7,221,939.27/3,980.88
  6. Step 6: Final answer
    x = 1,814.16

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1.5x scale

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.