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Finding the Fourth Proportional to 18,560.88, 25,619.83 and 12,821.29

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Solution

The fourth proportional to 18,560.88, 25,619.83 and 12,821.29 is: 17,697.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,560.88 : 25,619.83 = 12,821.29 : x
  2. Step 2: Convert to fraction form
    18,560.88/25,619.83 = 12,821.29/x
  3. Step 3: Cross multiply
    18,560.88x = 25,619.83 × 12,821.29
  4. Step 4: Simplify right side
    18,560.88x = 328,479,174.08
  5. Step 5: Solve for x
    x = 328,479,174.08/18,560.88
  6. Step 6: Final answer
    x = 17,697.39

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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.