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Finding the Fourth Proportional to 28,496.78, 39,324.78 and 15,921.54

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Solution

The fourth proportional to 28,496.78, 39,324.78 and 15,921.54 is: 21,971.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,496.78 : 39,324.78 = 15,921.54 : x
  2. Step 2: Convert to fraction form
    28,496.78/39,324.78 = 15,921.54/x
  3. Step 3: Cross multiply
    28,496.78x = 39,324.78 × 15,921.54
  4. Step 4: Simplify right side
    28,496.78x = 626,111,057.76
  5. Step 5: Solve for x
    x = 626,111,057.76/28,496.78
  6. Step 6: Final answer
    x = 21,971.29

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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.