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Finding the Fourth Proportional to 6,660.77, 9,991.15 and 1,980.75

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Solution

The fourth proportional to 6,660.77, 9,991.15 and 1,980.75 is: 2,971.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,660.77 : 9,991.15 = 1,980.75 : x
  2. Step 2: Convert to fraction form
    6,660.77/9,991.15 = 1,980.75/x
  3. Step 3: Cross multiply
    6,660.77x = 9,991.15 × 1,980.75
  4. Step 4: Simplify right side
    6,660.77x = 19,790,002.88
  5. Step 5: Solve for x
    x = 19,790,002.88/6,660.77
  6. Step 6: Final answer
    x = 2,971.13

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Similar ratio
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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.