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Finding the Fourth Proportional to 7,239,912.04, 9,990,804.90 and 4,020,855.40

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Solution

The fourth proportional to 7,239,912.04, 9,990,804.90 and 4,020,855.40 is: 5,548,628.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,239,912.04 : 9,990,804.90 = 4,020,855.40 : x
  2. Step 2: Convert to fraction form
    7,239,912.04/9,990,804.90 = 4,020,855.40/x
  3. Step 3: Cross multiply
    7,239,912.04x = 9,990,804.90 × 4,020,855.40
  4. Step 4: Simplify right side
    7,239,912.04x = 40,171,581,832,511.46
  5. Step 5: Solve for x
    x = 40,171,581,832,511.46/7,239,912.04
  6. Step 6: Final answer
    x = 5,548,628.44

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.