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Finding the Fourth Proportional to 18,611.20, 27,913.60 and 6,918.40

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Solution

The fourth proportional to 18,611.20, 27,913.60 and 6,918.40 is: 10,376.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,611.20 : 27,913.60 = 6,918.40 : x
  2. Step 2: Convert to fraction form
    18,611.20/27,913.60 = 6,918.40/x
  3. Step 3: Cross multiply
    18,611.20x = 27,913.60 × 6,918.40
  4. Step 4: Simplify right side
    18,611.20x = 193,117,450.24
  5. Step 5: Solve for x
    x = 193,117,450.24/18,611.20
  6. Step 6: Final answer
    x = 10,376.41

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.