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Finding the Fourth Proportional to 12,777.32, 17,620.90 and 7,991.08

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Solution

The fourth proportional to 12,777.32, 17,620.90 and 7,991.08 is: 11,020.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,777.32 : 17,620.90 = 7,991.08 : x
  2. Step 2: Convert to fraction form
    12,777.32/17,620.90 = 7,991.08/x
  3. Step 3: Cross multiply
    12,777.32x = 17,620.90 × 7,991.08
  4. Step 4: Simplify right side
    12,777.32x = 140,810,021.57
  5. Step 5: Solve for x
    x = 140,810,021.57/12,777.32
  6. Step 6: Final answer
    x = 11,020.31

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.