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Finding the Fourth Proportional to 13,486.99, 18,611.66 and 7,518.54

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Solution

The fourth proportional to 13,486.99, 18,611.66 and 7,518.54 is: 10,375.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,486.99 : 18,611.66 = 7,518.54 : x
  2. Step 2: Convert to fraction form
    13,486.99/18,611.66 = 7,518.54/x
  3. Step 3: Cross multiply
    13,486.99x = 18,611.66 × 7,518.54
  4. Step 4: Simplify right side
    13,486.99x = 139,932,435.91
  5. Step 5: Solve for x
    x = 139,932,435.91/13,486.99
  6. Step 6: Final answer
    x = 10,375.36

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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.