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Finding the Fourth Proportional to 18,745.42, 28,107.49 and 7,639.10

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Solution

The fourth proportional to 18,745.42, 28,107.49 and 7,639.10 is: 11,454.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,745.42 : 28,107.49 = 7,639.10 : x
  2. Step 2: Convert to fraction form
    18,745.42/28,107.49 = 7,639.10/x
  3. Step 3: Cross multiply
    18,745.42x = 28,107.49 × 7,639.10
  4. Step 4: Simplify right side
    18,745.42x = 214,715,888.66
  5. Step 5: Solve for x
    x = 214,715,888.66/18,745.42
  6. Step 6: Final answer
    x = 11,454.32

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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.