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Finding the Fourth Proportional to 13,086.74, 18,053.74 and 7,778.54

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Solution

The fourth proportional to 13,086.74, 18,053.74 and 7,778.54 is: 10,730.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,086.74 : 18,053.74 = 7,778.54 : x
  2. Step 2: Convert to fraction form
    13,086.74/18,053.74 = 7,778.54/x
  3. Step 3: Cross multiply
    13,086.74x = 18,053.74 × 7,778.54
  4. Step 4: Simplify right side
    13,086.74x = 140,431,738.74
  5. Step 5: Solve for x
    x = 140,431,738.74/13,086.74
  6. Step 6: Final answer
    x = 10,730.84

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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.