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Finding the Fourth Proportional to 13,380.93, 19,990 and 8,662.50

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Solution

The fourth proportional to 13,380.93, 19,990 and 8,662.50 is: 12,941.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,380.93 : 19,990 = 8,662.50 : x
  2. Step 2: Convert to fraction form
    13,380.93/19,990 = 8,662.50/x
  3. Step 3: Cross multiply
    13,380.93x = 19,990 × 8,662.50
  4. Step 4: Simplify right side
    13,380.93x = 173,163,375
  5. Step 5: Solve for x
    x = 173,163,375/13,380.93
  6. Step 6: Final answer
    x = 12,941.06

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.