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Finding the Fourth Proportional to 18,893.28, 28,339.29 and 10,145.28

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Solution

The fourth proportional to 18,893.28, 28,339.29 and 10,145.28 is: 15,217.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,893.28 : 28,339.29 = 10,145.28 : x
  2. Step 2: Convert to fraction form
    18,893.28/28,339.29 = 10,145.28/x
  3. Step 3: Cross multiply
    18,893.28x = 28,339.29 × 10,145.28
  4. Step 4: Simplify right side
    18,893.28x = 287,510,032.05
  5. Step 5: Solve for x
    x = 287,510,032.05/18,893.28
  6. Step 6: Final answer
    x = 15,217.58

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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.