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Finding the Fourth Proportional to 8,661.36, 12,990.28 and 3,980.08

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Solution

The fourth proportional to 8,661.36, 12,990.28 and 3,980.08 is: 5,969.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,661.36 : 12,990.28 = 3,980.08 : x
  2. Step 2: Convert to fraction form
    8,661.36/12,990.28 = 3,980.08/x
  3. Step 3: Cross multiply
    8,661.36x = 12,990.28 × 3,980.08
  4. Step 4: Simplify right side
    8,661.36x = 51,702,353.62
  5. Step 5: Solve for x
    x = 51,702,353.62/8,661.36
  6. Step 6: Final answer
    x = 5,969.31

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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.