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Finding the Third Proportional to 9,915 and 13,458.75

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Solution

The third proportional to 9,915 and 13,458.75 is: 18,269.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,915 : 13,458.75 = 13,458.75 : x
  2. Step 2: Convert to fraction form
    9,915/13,458.75 = 13,458.75/x
  3. Step 3: Cross multiply
    9,915x = 13,458.75 × 13,458.75
  4. Step 4: Simplify right side
    9,915x = 181,137,951.56
  5. Step 5: Solve for x
    x = 181,137,951.56/9,915
  6. Step 6: Final answer
    x = 18,269.08

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Why These Related Problems?

These problems maintain the same ratio (1.36) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.