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Finding the Fourth Proportional to 28,857.54, 39,824.03 and 15,936.78

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Solution

The fourth proportional to 28,857.54, 39,824.03 and 15,936.78 is: 21,993.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,857.54 : 39,824.03 = 15,936.78 : x
  2. Step 2: Convert to fraction form
    28,857.54/39,824.03 = 15,936.78/x
  3. Step 3: Cross multiply
    28,857.54x = 39,824.03 × 15,936.78
  4. Step 4: Simplify right side
    28,857.54x = 634,666,613.17
  5. Step 5: Solve for x
    x = 634,666,613.17/28,857.54
  6. Step 6: Final answer
    x = 21,993.09

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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.