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Finding the Fourth Proportional to 8,419.68, 12,629.48 and 4,518.72

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Solution

The fourth proportional to 8,419.68, 12,629.48 and 4,518.72 is: 6,778.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,419.68 : 12,629.48 = 4,518.72 : x
  2. Step 2: Convert to fraction form
    8,419.68/12,629.48 = 4,518.72/x
  3. Step 3: Cross multiply
    8,419.68x = 12,629.48 × 4,518.72
  4. Step 4: Simplify right side
    8,419.68x = 57,069,083.87
  5. Step 5: Solve for x
    x = 57,069,083.87/8,419.68
  6. Step 6: Final answer
    x = 6,778.06

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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.