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Finding the Fourth Proportional to 28,243.76, 38,976.27 and 15,668.51

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Solution

The fourth proportional to 28,243.76, 38,976.27 and 15,668.51 is: 21,622.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,243.76 : 38,976.27 = 15,668.51 : x
  2. Step 2: Convert to fraction form
    28,243.76/38,976.27 = 15,668.51/x
  3. Step 3: Cross multiply
    28,243.76x = 38,976.27 × 15,668.51
  4. Step 4: Simplify right side
    28,243.76x = 610,700,076.26
  5. Step 5: Solve for x
    x = 610,700,076.26/28,243.76
  6. Step 6: Final answer
    x = 21,622.48

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1.5x scale

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.