Home / 20,413.21-28,168.70-11,339.09

Finding the Fourth Proportional to 20,413.21, 28,168.70 and 11,339.09

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Solution

The fourth proportional to 20,413.21, 28,168.70 and 11,339.09 is: 15,647.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,413.21 : 28,168.70 = 11,339.09 : x
  2. Step 2: Convert to fraction form
    20,413.21/28,168.70 = 11,339.09/x
  3. Step 3: Cross multiply
    20,413.21x = 28,168.70 × 11,339.09
  4. Step 4: Simplify right side
    20,413.21x = 319,407,424.48
  5. Step 5: Solve for x
    x = 319,407,424.48/20,413.21
  6. Step 6: Final answer
    x = 15,647.09

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Double scale
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Similar ratio
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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.