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Finding the Fourth Proportional to 45,919.40, 68,879.96 and 12,639.28

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Solution

The fourth proportional to 45,919.40, 68,879.96 and 12,639.28 is: 18,959.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    45,919.40 : 68,879.96 = 12,639.28 : x
  2. Step 2: Convert to fraction form
    45,919.40/68,879.96 = 12,639.28/x
  3. Step 3: Cross multiply
    45,919.40x = 68,879.96 × 12,639.28
  4. Step 4: Simplify right side
    45,919.40x = 870,593,100.83
  5. Step 5: Solve for x
    x = 870,593,100.83/45,919.40
  6. Step 6: Final answer
    x = 18,959.16

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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.