Home / 21,122.76-31,620.99-12,777.57

Finding the Fourth Proportional to 21,122.76, 31,620.99 and 12,777.57

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Solution

The fourth proportional to 21,122.76, 31,620.99 and 12,777.57 is: 19,128.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,122.76 : 31,620.99 = 12,777.57 : x
  2. Step 2: Convert to fraction form
    21,122.76/31,620.99 = 12,777.57/x
  3. Step 3: Cross multiply
    21,122.76x = 31,620.99 × 12,777.57
  4. Step 4: Simplify right side
    21,122.76x = 404,039,413.19
  5. Step 5: Solve for x
    x = 404,039,413.19/21,122.76
  6. Step 6: Final answer
    x = 19,128.15

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1.5x scale

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.