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Finding the Fourth Proportional to 18,680.40, 28,009.80 and 6,994.80

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Solution

The fourth proportional to 18,680.40, 28,009.80 and 6,994.80 is: 10,488.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,680.40 : 28,009.80 = 6,994.80 : x
  2. Step 2: Convert to fraction form
    18,680.40/28,009.80 = 6,994.80/x
  3. Step 3: Cross multiply
    18,680.40x = 28,009.80 × 6,994.80
  4. Step 4: Simplify right side
    18,680.40x = 195,922,949.04
  5. Step 5: Solve for x
    x = 195,922,949.04/18,680.40
  6. Step 6: Final answer
    x = 10,488.16

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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.