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Finding the Fourth Proportional to 13,486.74, 18,611.74 and 7,518.25

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Solution

The fourth proportional to 13,486.74, 18,611.74 and 7,518.25 is: 10,375.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,486.74 : 18,611.74 = 7,518.25 : x
  2. Step 2: Convert to fraction form
    13,486.74/18,611.74 = 7,518.25/x
  3. Step 3: Cross multiply
    13,486.74x = 18,611.74 × 7,518.25
  4. Step 4: Simplify right side
    13,486.74x = 139,927,746.92
  5. Step 5: Solve for x
    x = 139,927,746.92/13,486.74
  6. Step 6: Final answer
    x = 10,375.21

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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.