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Finding the Fourth Proportional to 3,980.90, 5,971.62 and 1,059.14

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Solution

The fourth proportional to 3,980.90, 5,971.62 and 1,059.14 is: 1,588.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,980.90 : 5,971.62 = 1,059.14 : x
  2. Step 2: Convert to fraction form
    3,980.90/5,971.62 = 1,059.14/x
  3. Step 3: Cross multiply
    3,980.90x = 5,971.62 × 1,059.14
  4. Step 4: Simplify right side
    3,980.90x = 6,324,781.61
  5. Step 5: Solve for x
    x = 6,324,781.61/3,980.90
  6. Step 6: Final answer
    x = 1,588.78

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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.