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Finding the Fourth Proportional to 8,326.16, 12,489.64 and 3,131.64

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Solution

The fourth proportional to 8,326.16, 12,489.64 and 3,131.64 is: 4,697.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,326.16 : 12,489.64 = 3,131.64 : x
  2. Step 2: Convert to fraction form
    8,326.16/12,489.64 = 3,131.64/x
  3. Step 3: Cross multiply
    8,326.16x = 12,489.64 × 3,131.64
  4. Step 4: Simplify right side
    8,326.16x = 39,113,056.21
  5. Step 5: Solve for x
    x = 39,113,056.21/8,326.16
  6. Step 6: Final answer
    x = 4,697.61

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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.