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Finding the Fourth Proportional to 12,620.21, 17,413.08 and 7,242.31

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Solution

The fourth proportional to 12,620.21, 17,413.08 and 7,242.31 is: 9,992.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,620.21 : 17,413.08 = 7,242.31 : x
  2. Step 2: Convert to fraction form
    12,620.21/17,413.08 = 7,242.31/x
  3. Step 3: Cross multiply
    12,620.21x = 17,413.08 × 7,242.31
  4. Step 4: Simplify right side
    12,620.21x = 126,110,918.02
  5. Step 5: Solve for x
    x = 126,110,918.02/12,620.21
  6. Step 6: Final answer
    x = 9,992.78

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.