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Finding the Fourth Proportional to 13,578.51, 18,738.78 and 7,608.81

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Solution

The fourth proportional to 13,578.51, 18,738.78 and 7,608.81 is: 10,500.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,578.51 : 18,738.78 = 7,608.81 : x
  2. Step 2: Convert to fraction form
    13,578.51/18,738.78 = 7,608.81/x
  3. Step 3: Cross multiply
    13,578.51x = 18,738.78 × 7,608.81
  4. Step 4: Simplify right side
    13,578.51x = 142,579,816.65
  5. Step 5: Solve for x
    x = 142,579,816.65/13,578.51
  6. Step 6: Final answer
    x = 10,500.40

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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.