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Finding the Fourth Proportional to 13,486.64, 18,611.62 and 7,518.40

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Solution

The fourth proportional to 13,486.64, 18,611.62 and 7,518.40 is: 10,375.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,486.64 : 18,611.62 = 7,518.40 : x
  2. Step 2: Convert to fraction form
    13,486.64/18,611.62 = 7,518.40/x
  3. Step 3: Cross multiply
    13,486.64x = 18,611.62 × 7,518.40
  4. Step 4: Simplify right side
    13,486.64x = 139,929,603.81
  5. Step 5: Solve for x
    x = 139,929,603.81/13,486.64
  6. Step 6: Final answer
    x = 10,375.42

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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.