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Finding the Fourth Proportional to 8,659.70, 12,989.52 and 2,419.70

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Solution

The fourth proportional to 8,659.70, 12,989.52 and 2,419.70 is: 3,629.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,659.70 : 12,989.52 = 2,419.70 : x
  2. Step 2: Convert to fraction form
    8,659.70/12,989.52 = 2,419.70/x
  3. Step 3: Cross multiply
    8,659.70x = 12,989.52 × 2,419.70
  4. Step 4: Simplify right side
    8,659.70x = 31,430,741.54
  5. Step 5: Solve for x
    x = 31,430,741.54/8,659.70
  6. Step 6: Final answer
    x = 3,629.54

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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.