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Finding the Fourth Proportional to 28,217, 38,940.81 and 15,641.75

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Solution

The fourth proportional to 28,217, 38,940.81 and 15,641.75 is: 21,586.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,217 : 38,940.81 = 15,641.75 : x
  2. Step 2: Convert to fraction form
    28,217/38,940.81 = 15,641.75/x
  3. Step 3: Cross multiply
    28,217x = 38,940.81 × 15,641.75
  4. Step 4: Simplify right side
    28,217x = 609,102,414.82
  5. Step 5: Solve for x
    x = 609,102,414.82/28,217
  6. Step 6: Final answer
    x = 21,586.36

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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.