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Finding the Fourth Proportional to 28,020.52, 38,668.62 and 15,274

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Solution

The fourth proportional to 28,020.52, 38,668.62 and 15,274 is: 21,078.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,020.52 : 38,668.62 = 15,274 : x
  2. Step 2: Convert to fraction form
    28,020.52/38,668.62 = 15,274/x
  3. Step 3: Cross multiply
    28,020.52x = 38,668.62 × 15,274
  4. Step 4: Simplify right side
    28,020.52x = 590,624,501.88
  5. Step 5: Solve for x
    x = 590,624,501.88/28,020.52
  6. Step 6: Final answer
    x = 21,078.28

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Why These Related Problems?

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