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Finding the Fourth Proportional to 18,992.25, 28,488.36 and 7,891.38

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Solution

The fourth proportional to 18,992.25, 28,488.36 and 7,891.38 is: 11,837.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,992.25 : 28,488.36 = 7,891.38 : x
  2. Step 2: Convert to fraction form
    18,992.25/28,488.36 = 7,891.38/x
  3. Step 3: Cross multiply
    18,992.25x = 28,488.36 × 7,891.38
  4. Step 4: Simplify right side
    18,992.25x = 224,812,474.34
  5. Step 5: Solve for x
    x = 224,812,474.34/18,992.25
  6. Step 6: Final answer
    x = 11,837.06

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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.