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Finding the Fourth Proportional to 1,388,888.01, 1,916,965.20 and 845,198.96

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Solution

The fourth proportional to 1,388,888.01, 1,916,965.20 and 845,198.96 is: 1,166,556.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,388,888.01 : 1,916,965.20 = 845,198.96 : x
  2. Step 2: Convert to fraction form
    1,388,888.01/1,916,965.20 = 845,198.96/x
  3. Step 3: Cross multiply
    1,388,888.01x = 1,916,965.20 × 845,198.96
  4. Step 4: Simplify right side
    1,388,888.01x = 1,620,216,983,811.37
  5. Step 5: Solve for x
    x = 1,620,216,983,811.37/1,388,888.01
  6. Step 6: Final answer
    x = 1,166,556.97

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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.