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Finding the Fourth Proportional to 28,021.80, 38,668.91 and 15,274.70

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Solution

The fourth proportional to 28,021.80, 38,668.91 and 15,274.70 is: 21,078.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,021.80 : 38,668.91 = 15,274.70 : x
  2. Step 2: Convert to fraction form
    28,021.80/38,668.91 = 15,274.70/x
  3. Step 3: Cross multiply
    28,021.80x = 38,668.91 × 15,274.70
  4. Step 4: Simplify right side
    28,021.80x = 590,656,134.44
  5. Step 5: Solve for x
    x = 590,656,134.44/28,021.80
  6. Step 6: Final answer
    x = 21,078.45

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.