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Finding the Fourth Proportional to 28,078.99, 38,702.86 and 19,905.38

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Solution

The fourth proportional to 28,078.99, 38,702.86 and 19,905.38 is: 27,436.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,078.99 : 38,702.86 = 19,905.38 : x
  2. Step 2: Convert to fraction form
    28,078.99/38,702.86 = 19,905.38/x
  3. Step 3: Cross multiply
    28,078.99x = 38,702.86 × 19,905.38
  4. Step 4: Simplify right side
    28,078.99x = 770,395,149.21
  5. Step 5: Solve for x
    x = 770,395,149.21/28,078.99
  6. Step 6: Final answer
    x = 27,436.71

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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.