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Finding the Fourth Proportional to 12,976.80, 19,486.80 and 7,137.60

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Solution

The fourth proportional to 12,976.80, 19,486.80 and 7,137.60 is: 10,718.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,976.80 : 19,486.80 = 7,137.60 : x
  2. Step 2: Convert to fraction form
    12,976.80/19,486.80 = 7,137.60/x
  3. Step 3: Cross multiply
    12,976.80x = 19,486.80 × 7,137.60
  4. Step 4: Simplify right side
    12,976.80x = 139,088,983.68
  5. Step 5: Solve for x
    x = 139,088,983.68/12,976.80
  6. Step 6: Final answer
    x = 10,718.28

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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.