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Finding the Fourth Proportional to 12,645.72, 18,963.72 and 8,738.28

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Solution

The fourth proportional to 12,645.72, 18,963.72 and 8,738.28 is: 13,104.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,645.72 : 18,963.72 = 8,738.28 : x
  2. Step 2: Convert to fraction form
    12,645.72/18,963.72 = 8,738.28/x
  3. Step 3: Cross multiply
    12,645.72x = 18,963.72 × 8,738.28
  4. Step 4: Simplify right side
    12,645.72x = 165,710,295.20
  5. Step 5: Solve for x
    x = 165,710,295.20/12,645.72
  6. Step 6: Final answer
    x = 13,104.06

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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.