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Finding the Fourth Proportional to 8,391.39, 12,518.48 and 7,794.83

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Solution

The fourth proportional to 8,391.39, 12,518.48 and 7,794.83 is: 11,628.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,391.39 : 12,518.48 = 7,794.83 : x
  2. Step 2: Convert to fraction form
    8,391.39/12,518.48 = 7,794.83/x
  3. Step 3: Cross multiply
    8,391.39x = 12,518.48 × 7,794.83
  4. Step 4: Simplify right side
    8,391.39x = 97,579,321.89
  5. Step 5: Solve for x
    x = 97,579,321.89/8,391.39
  6. Step 6: Final answer
    x = 11,628.51

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.