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Finding the Fourth Proportional to 28,195.76, 38,911.78 and 15,448.97

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Solution

The fourth proportional to 28,195.76, 38,911.78 and 15,448.97 is: 21,320.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,195.76 : 38,911.78 = 15,448.97 : x
  2. Step 2: Convert to fraction form
    28,195.76/38,911.78 = 15,448.97/x
  3. Step 3: Cross multiply
    28,195.76x = 38,911.78 × 15,448.97
  4. Step 4: Simplify right side
    28,195.76x = 601,146,972.47
  5. Step 5: Solve for x
    x = 601,146,972.47/28,195.76
  6. Step 6: Final answer
    x = 21,320.47

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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.