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Finding the Fourth Proportional to 19,328.85, 28,987.20 and 11,922.21

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Solution

The fourth proportional to 19,328.85, 28,987.20 and 11,922.21 is: 17,879.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,328.85 : 28,987.20 = 11,922.21 : x
  2. Step 2: Convert to fraction form
    19,328.85/28,987.20 = 11,922.21/x
  3. Step 3: Cross multiply
    19,328.85x = 28,987.20 × 11,922.21
  4. Step 4: Simplify right side
    19,328.85x = 345,591,485.71
  5. Step 5: Solve for x
    x = 345,591,485.71/19,328.85
  6. Step 6: Final answer
    x = 17,879.57

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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.