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Finding the Fourth Proportional to 3,978,982.80, 5,968,474.20 and 1,319,590.80

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Solution

The fourth proportional to 3,978,982.80, 5,968,474.20 and 1,319,590.80 is: 1,979,386.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,978,982.80 : 5,968,474.20 = 1,319,590.80 : x
  2. Step 2: Convert to fraction form
    3,978,982.80/5,968,474.20 = 1,319,590.80/x
  3. Step 3: Cross multiply
    3,978,982.80x = 5,968,474.20 × 1,319,590.80
  4. Step 4: Simplify right side
    3,978,982.80x = 7,875,943,644,357.36
  5. Step 5: Solve for x
    x = 7,875,943,644,357.36/3,978,982.80
  6. Step 6: Final answer
    x = 1,979,386.20

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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.