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Finding the Third Proportional to 77,413.50 and 128,120.50

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Solution

The third proportional to 77,413.50 and 128,120.50 is: 212,041.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    77,413.50 : 128,120.50 = 128,120.50 : x
  2. Step 2: Convert to fraction form
    77,413.50/128,120.50 = 128,120.50/x
  3. Step 3: Cross multiply
    77,413.50x = 128,120.50 × 128,120.50
  4. Step 4: Simplify right side
    77,413.50x = 16,414,862,520.25
  5. Step 5: Solve for x
    x = 16,414,862,520.25/77,413.50
  6. Step 6: Final answer
    x = 212,041.34

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Why These Related Problems?

These problems maintain the same ratio (1.66) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.