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Finding the Fourth Proportional to 19,984.40, 29,976.60 and 19,131.20

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Solution

The fourth proportional to 19,984.40, 29,976.60 and 19,131.20 is: 28,696.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,984.40 : 29,976.60 = 19,131.20 : x
  2. Step 2: Convert to fraction form
    19,984.40/29,976.60 = 19,131.20/x
  3. Step 3: Cross multiply
    19,984.40x = 29,976.60 × 19,131.20
  4. Step 4: Simplify right side
    19,984.40x = 573,488,329.92
  5. Step 5: Solve for x
    x = 573,488,329.92/19,984.40
  6. Step 6: Final answer
    x = 28,696.80

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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.