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Finding the Fourth Proportional to 12,915, 19,379.50 and 9,999

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Solution

The fourth proportional to 12,915, 19,379.50 and 9,999 is: 15,003.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,915 : 19,379.50 = 9,999 : x
  2. Step 2: Convert to fraction form
    12,915/19,379.50 = 9,999/x
  3. Step 3: Cross multiply
    12,915x = 19,379.50 × 9,999
  4. Step 4: Simplify right side
    12,915x = 193,775,620.50
  5. Step 5: Solve for x
    x = 193,775,620.50/12,915
  6. Step 6: Final answer
    x = 15,003.92

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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.