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Finding the Fourth Proportional to 1,388,438.91, 1,916,020.31 and 784,826.91

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Solution

The fourth proportional to 1,388,438.91, 1,916,020.31 and 784,826.91 is: 1,083,046.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,388,438.91 : 1,916,020.31 = 784,826.91 : x
  2. Step 2: Convert to fraction form
    1,388,438.91/1,916,020.31 = 784,826.91/x
  3. Step 3: Cross multiply
    1,388,438.91x = 1,916,020.31 × 784,826.91
  4. Step 4: Simplify right side
    1,388,438.91x = 1,503,744,299,394.54
  5. Step 5: Solve for x
    x = 1,503,744,299,394.54/1,388,438.91
  6. Step 6: Final answer
    x = 1,083,046.79

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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.