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Finding the Fourth Proportional to 13,539.88, 18,685.18 and 7,571.88

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Solution

The fourth proportional to 13,539.88, 18,685.18 and 7,571.88 is: 10,449.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,539.88 : 18,685.18 = 7,571.88 : x
  2. Step 2: Convert to fraction form
    13,539.88/18,685.18 = 7,571.88/x
  3. Step 3: Cross multiply
    13,539.88x = 18,685.18 × 7,571.88
  4. Step 4: Simplify right side
    13,539.88x = 141,481,950.20
  5. Step 5: Solve for x
    x = 141,481,950.20/13,539.88
  6. Step 6: Final answer
    x = 10,449.27

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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.