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Finding the Fourth Proportional to 3,280,619.20, 4,920,928.80 and 916,715.20

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Solution

The fourth proportional to 3,280,619.20, 4,920,928.80 and 916,715.20 is: 1,375,072.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,280,619.20 : 4,920,928.80 = 916,715.20 : x
  2. Step 2: Convert to fraction form
    3,280,619.20/4,920,928.80 = 916,715.20/x
  3. Step 3: Cross multiply
    3,280,619.20x = 4,920,928.80 × 916,715.20
  4. Step 4: Simplify right side
    3,280,619.20x = 4,511,090,229,077.76
  5. Step 5: Solve for x
    x = 4,511,090,229,077.76/3,280,619.20
  6. Step 6: Final answer
    x = 1,375,072.80

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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.