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Finding the Fourth Proportional to 12,309.66, 18,471.78 and 4,917.60

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Solution

The fourth proportional to 12,309.66, 18,471.78 and 4,917.60 is: 7,379.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,309.66 : 18,471.78 = 4,917.60 : x
  2. Step 2: Convert to fraction form
    12,309.66/18,471.78 = 4,917.60/x
  3. Step 3: Cross multiply
    12,309.66x = 18,471.78 × 4,917.60
  4. Step 4: Simplify right side
    12,309.66x = 90,836,825.33
  5. Step 5: Solve for x
    x = 90,836,825.33/12,309.66
  6. Step 6: Final answer
    x = 7,379.31

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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.