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Finding the Fourth Proportional to 20,028.40, 30,042.60 and 19,175.20

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Solution

The fourth proportional to 20,028.40, 30,042.60 and 19,175.20 is: 28,762.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,028.40 : 30,042.60 = 19,175.20 : x
  2. Step 2: Convert to fraction form
    20,028.40/30,042.60 = 19,175.20/x
  3. Step 3: Cross multiply
    20,028.40x = 30,042.60 × 19,175.20
  4. Step 4: Simplify right side
    20,028.40x = 576,072,863.52
  5. Step 5: Solve for x
    x = 576,072,863.52/20,028.40
  6. Step 6: Final answer
    x = 28,762.80

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Similar ratio
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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.