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Finding the Fourth Proportional to 20,474.79, 30,705.65 and 7,991.78

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Solution

The fourth proportional to 20,474.79, 30,705.65 and 7,991.78 is: 11,985.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,474.79 : 30,705.65 = 7,991.78 : x
  2. Step 2: Convert to fraction form
    20,474.79/30,705.65 = 7,991.78/x
  3. Step 3: Cross multiply
    20,474.79x = 30,705.65 × 7,991.78
  4. Step 4: Simplify right side
    20,474.79x = 245,392,636.04
  5. Step 5: Solve for x
    x = 245,392,636.04/20,474.79
  6. Step 6: Final answer
    x = 11,985.11

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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.