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Finding the Fourth Proportional to 20,474.60, 30,712.54 and 7,994.12

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Solution

The fourth proportional to 20,474.60, 30,712.54 and 7,994.12 is: 11,991.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,474.60 : 30,712.54 = 7,994.12 : x
  2. Step 2: Convert to fraction form
    20,474.60/30,712.54 = 7,994.12/x
  3. Step 3: Cross multiply
    20,474.60x = 30,712.54 × 7,994.12
  4. Step 4: Simplify right side
    20,474.60x = 245,519,730.26
  5. Step 5: Solve for x
    x = 245,519,730.26/20,474.60
  6. Step 6: Final answer
    x = 11,991.43

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.