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Finding the Fourth Proportional to 13,458.78, 18,575.08 and 8,081.58

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Solution

The fourth proportional to 13,458.78, 18,575.08 and 8,081.58 is: 11,153.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,458.78 : 18,575.08 = 8,081.58 : x
  2. Step 2: Convert to fraction form
    13,458.78/18,575.08 = 8,081.58/x
  3. Step 3: Cross multiply
    13,458.78x = 18,575.08 × 8,081.58
  4. Step 4: Simplify right side
    13,458.78x = 150,115,995.03
  5. Step 5: Solve for x
    x = 150,115,995.03/13,458.78
  6. Step 6: Final answer
    x = 11,153.76

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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.