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Finding the Fourth Proportional to 1,984,930.80, 2,978,951.40 and 920,104.80

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Solution

The fourth proportional to 1,984,930.80, 2,978,951.40 and 920,104.80 is: 1,380,878.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,984,930.80 : 2,978,951.40 = 920,104.80 : x
  2. Step 2: Convert to fraction form
    1,984,930.80/2,978,951.40 = 920,104.80/x
  3. Step 3: Cross multiply
    1,984,930.80x = 2,978,951.40 × 920,104.80
  4. Step 4: Simplify right side
    1,984,930.80x = 2,740,947,482,106.72
  5. Step 5: Solve for x
    x = 2,740,947,482,106.72/1,984,930.80
  6. Step 6: Final answer
    x = 1,380,878.11

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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.