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Finding the Fourth Proportional to 18,735.62, 28,079.05 and 7,629.30

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Solution

The fourth proportional to 18,735.62, 28,079.05 and 7,629.30 is: 11,434.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,735.62 : 28,079.05 = 7,629.30 : x
  2. Step 2: Convert to fraction form
    18,735.62/28,079.05 = 7,629.30/x
  3. Step 3: Cross multiply
    18,735.62x = 28,079.05 × 7,629.30
  4. Step 4: Simplify right side
    18,735.62x = 214,223,496.17
  5. Step 5: Solve for x
    x = 214,223,496.17/18,735.62
  6. Step 6: Final answer
    x = 11,434.02

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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.