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Finding the Fourth Proportional to 1,297,928.80, 1,946,893.20 and 920,015.20

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Solution

The fourth proportional to 1,297,928.80, 1,946,893.20 and 920,015.20 is: 1,380,022.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,297,928.80 : 1,946,893.20 = 920,015.20 : x
  2. Step 2: Convert to fraction form
    1,297,928.80/1,946,893.20 = 920,015.20/x
  3. Step 3: Cross multiply
    1,297,928.80x = 1,946,893.20 × 920,015.20
  4. Step 4: Simplify right side
    1,297,928.80x = 1,791,171,336,776.64
  5. Step 5: Solve for x
    x = 1,791,171,336,776.64/1,297,928.80
  6. Step 6: Final answer
    x = 1,380,022.80

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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.