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Finding the Fourth Proportional to 1,388,435.72, 1,916,015.92 and 784,823.72

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Solution

The fourth proportional to 1,388,435.72, 1,916,015.92 and 784,823.72 is: 1,083,042.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,388,435.72 : 1,916,015.92 = 784,823.72 : x
  2. Step 2: Convert to fraction form
    1,388,435.72/1,916,015.92 = 784,823.72/x
  3. Step 3: Cross multiply
    1,388,435.72x = 1,916,015.92 × 784,823.72
  4. Step 4: Simplify right side
    1,388,435.72x = 1,503,734,730,371.48
  5. Step 5: Solve for x
    x = 1,503,734,730,371.48/1,388,435.72
  6. Step 6: Final answer
    x = 1,083,042.39

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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.