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Finding the Fourth Proportional to 18,893.78, 28,340.04 and 10,145.78

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Solution

The fourth proportional to 18,893.78, 28,340.04 and 10,145.78 is: 15,218.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,893.78 : 28,340.04 = 10,145.78 : x
  2. Step 2: Convert to fraction form
    18,893.78/28,340.04 = 10,145.78/x
  3. Step 3: Cross multiply
    18,893.78x = 28,340.04 × 10,145.78
  4. Step 4: Simplify right side
    18,893.78x = 287,531,811.03
  5. Step 5: Solve for x
    x = 287,531,811.03/18,893.78
  6. Step 6: Final answer
    x = 15,218.33

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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.