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Finding the Fourth Proportional to 15,171.30, 20,936.80 and 8,456.58

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Solution

The fourth proportional to 15,171.30, 20,936.80 and 8,456.58 is: 11,670.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,171.30 : 20,936.80 = 8,456.58 : x
  2. Step 2: Convert to fraction form
    15,171.30/20,936.80 = 8,456.58/x
  3. Step 3: Cross multiply
    15,171.30x = 20,936.80 × 8,456.58
  4. Step 4: Simplify right side
    15,171.30x = 177,053,724.14
  5. Step 5: Solve for x
    x = 177,053,724.14/15,171.30
  6. Step 6: Final answer
    x = 11,670.31

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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.