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Finding the Fourth Proportional to 18,961.25, 28,455.98 and 7,125.93

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Solution

The fourth proportional to 18,961.25, 28,455.98 and 7,125.93 is: 10,694.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,961.25 : 28,455.98 = 7,125.93 : x
  2. Step 2: Convert to fraction form
    18,961.25/28,455.98 = 7,125.93/x
  3. Step 3: Cross multiply
    18,961.25x = 28,455.98 × 7,125.93
  4. Step 4: Simplify right side
    18,961.25x = 202,775,285.93
  5. Step 5: Solve for x
    x = 202,775,285.93/18,961.25
  6. Step 6: Final answer
    x = 10,694.20

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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.