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Finding the Fourth Proportional to 1,438,890.81, 1,985,669.64 and 794,311.44

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Solution

The fourth proportional to 1,438,890.81, 1,985,669.64 and 794,311.44 is: 1,096,149.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,438,890.81 : 1,985,669.64 = 794,311.44 : x
  2. Step 2: Convert to fraction form
    1,438,890.81/1,985,669.64 = 794,311.44/x
  3. Step 3: Cross multiply
    1,438,890.81x = 1,985,669.64 × 794,311.44
  4. Step 4: Simplify right side
    1,438,890.81x = 1,577,240,111,112.68
  5. Step 5: Solve for x
    x = 1,577,240,111,112.68/1,438,890.81
  6. Step 6: Final answer
    x = 1,096,149.97

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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.