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Finding the Fourth Proportional to 8,505.09, 12,739.19 and 5,208.21

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Solution

The fourth proportional to 8,505.09, 12,739.19 and 5,208.21 is: 7,801.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,505.09 : 12,739.19 = 5,208.21 : x
  2. Step 2: Convert to fraction form
    8,505.09/12,739.19 = 5,208.21/x
  3. Step 3: Cross multiply
    8,505.09x = 12,739.19 × 5,208.21
  4. Step 4: Simplify right side
    8,505.09x = 66,348,350.71
  5. Step 5: Solve for x
    x = 66,348,350.71/8,505.09
  6. Step 6: Final answer
    x = 7,801.02

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1.5x scale

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.