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Finding the Fourth Proportional to 18,983.32, 28,475.73 and 7,135.90

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Solution

The fourth proportional to 18,983.32, 28,475.73 and 7,135.90 is: 10,704.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,983.32 : 28,475.73 = 7,135.90 : x
  2. Step 2: Convert to fraction form
    18,983.32/28,475.73 = 7,135.90/x
  3. Step 3: Cross multiply
    18,983.32x = 28,475.73 × 7,135.90
  4. Step 4: Simplify right side
    18,983.32x = 203,199,961.71
  5. Step 5: Solve for x
    x = 203,199,961.71/18,983.32
  6. Step 6: Final answer
    x = 10,704.13

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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.