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Finding the Fourth Proportional to 12,720.64, 19,087.36 and 8,608

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Solution

The fourth proportional to 12,720.64, 19,087.36 and 8,608 is: 12,916.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,720.64 : 19,087.36 = 8,608 : x
  2. Step 2: Convert to fraction form
    12,720.64/19,087.36 = 8,608/x
  3. Step 3: Cross multiply
    12,720.64x = 19,087.36 × 8,608
  4. Step 4: Simplify right side
    12,720.64x = 164,303,994.88
  5. Step 5: Solve for x
    x = 164,303,994.88/12,720.64
  6. Step 6: Final answer
    x = 12,916.33

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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.