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Finding the Fourth Proportional to 13,129.68, 18,118.80 and 7,540.68

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Solution

The fourth proportional to 13,129.68, 18,118.80 and 7,540.68 is: 10,406.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,129.68 : 18,118.80 = 7,540.68 : x
  2. Step 2: Convert to fraction form
    13,129.68/18,118.80 = 7,540.68/x
  3. Step 3: Cross multiply
    13,129.68x = 18,118.80 × 7,540.68
  4. Step 4: Simplify right side
    13,129.68x = 136,628,072.78
  5. Step 5: Solve for x
    x = 136,628,072.78/13,129.68
  6. Step 6: Final answer
    x = 10,406.05

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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.