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Finding the Fourth Proportional to 12,485.51, 18,737.48 and 5,911.68

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Solution

The fourth proportional to 12,485.51, 18,737.48 and 5,911.68 is: 8,871.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,485.51 : 18,737.48 = 5,911.68 : x
  2. Step 2: Convert to fraction form
    12,485.51/18,737.48 = 5,911.68/x
  3. Step 3: Cross multiply
    12,485.51x = 18,737.48 × 5,911.68
  4. Step 4: Simplify right side
    12,485.51x = 110,770,037.56
  5. Step 5: Solve for x
    x = 110,770,037.56/12,485.51
  6. Step 6: Final answer
    x = 8,871.89

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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.