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Finding the Fourth Proportional to 28,490.92, 42,745.02 and 20,186.98

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Solution

The fourth proportional to 28,490.92, 42,745.02 and 20,186.98 is: 30,286.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,490.92 : 42,745.02 = 20,186.98 : x
  2. Step 2: Convert to fraction form
    28,490.92/42,745.02 = 20,186.98/x
  3. Step 3: Cross multiply
    28,490.92x = 42,745.02 × 20,186.98
  4. Step 4: Simplify right side
    28,490.92x = 862,892,863.84
  5. Step 5: Solve for x
    x = 862,892,863.84/28,490.92
  6. Step 6: Final answer
    x = 30,286.59

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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.