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Finding the Fourth Proportional to 8,321.55, 11,485.67 and 4,786.80

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Solution

The fourth proportional to 8,321.55, 11,485.67 and 4,786.80 is: 6,606.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,321.55 : 11,485.67 = 4,786.80 : x
  2. Step 2: Convert to fraction form
    8,321.55/11,485.67 = 4,786.80/x
  3. Step 3: Cross multiply
    8,321.55x = 11,485.67 × 4,786.80
  4. Step 4: Simplify right side
    8,321.55x = 54,979,605.16
  5. Step 5: Solve for x
    x = 54,979,605.16/8,321.55
  6. Step 6: Final answer
    x = 6,606.89

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.