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Finding the Fourth Proportional to 12,679.64, 17,512.27 and 8,639.47

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Solution

The fourth proportional to 12,679.64, 17,512.27 and 8,639.47 is: 11,932.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,679.64 : 17,512.27 = 8,639.47 : x
  2. Step 2: Convert to fraction form
    12,679.64/17,512.27 = 8,639.47/x
  3. Step 3: Cross multiply
    12,679.64x = 17,512.27 × 8,639.47
  4. Step 4: Simplify right side
    12,679.64x = 151,296,633.08
  5. Step 5: Solve for x
    x = 151,296,633.08/12,679.64
  6. Step 6: Final answer
    x = 11,932.25

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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.