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Finding the Fourth Proportional to 8,611.02, 12,918.34 and 2,771.72

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Solution

The fourth proportional to 8,611.02, 12,918.34 and 2,771.72 is: 4,158.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,611.02 : 12,918.34 = 2,771.72 : x
  2. Step 2: Convert to fraction form
    8,611.02/12,918.34 = 2,771.72/x
  3. Step 3: Cross multiply
    8,611.02x = 12,918.34 × 2,771.72
  4. Step 4: Simplify right side
    8,611.02x = 35,806,021.34
  5. Step 5: Solve for x
    x = 35,806,021.34/8,611.02
  6. Step 6: Final answer
    x = 4,158.16

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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.