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Finding the Fourth Proportional to 18,758.82, 28,138.27 and 7,665.50

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Solution

The fourth proportional to 18,758.82, 28,138.27 and 7,665.50 is: 11,498.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,758.82 : 28,138.27 = 7,665.50 : x
  2. Step 2: Convert to fraction form
    18,758.82/28,138.27 = 7,665.50/x
  3. Step 3: Cross multiply
    18,758.82x = 28,138.27 × 7,665.50
  4. Step 4: Simplify right side
    18,758.82x = 215,693,979.03
  5. Step 5: Solve for x
    x = 215,693,979.03/18,758.82
  6. Step 6: Final answer
    x = 11,498.27

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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.