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Finding the Fourth Proportional to 13,041.88, 17,991.12 and 8,321.20

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Solution

The fourth proportional to 13,041.88, 17,991.12 and 8,321.20 is: 11,479.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,041.88 : 17,991.12 = 8,321.20 : x
  2. Step 2: Convert to fraction form
    13,041.88/17,991.12 = 8,321.20/x
  3. Step 3: Cross multiply
    13,041.88x = 17,991.12 × 8,321.20
  4. Step 4: Simplify right side
    13,041.88x = 149,707,707.74
  5. Step 5: Solve for x
    x = 149,707,707.74/13,041.88
  6. Step 6: Final answer
    x = 11,479.00

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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.