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Finding the Fourth Proportional to 1,392,509.76, 1,921,669.92 and 789,015.36

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Solution

The fourth proportional to 1,392,509.76, 1,921,669.92 and 789,015.36 is: 1,088,844.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,392,509.76 : 1,921,669.92 = 789,015.36 : x
  2. Step 2: Convert to fraction form
    1,392,509.76/1,921,669.92 = 789,015.36/x
  3. Step 3: Cross multiply
    1,392,509.76x = 1,921,669.92 × 789,015.36
  4. Step 4: Simplify right side
    1,392,509.76x = 1,516,227,083,729.97
  5. Step 5: Solve for x
    x = 1,516,227,083,729.97/1,392,509.76
  6. Step 6: Final answer
    x = 1,088,844.85

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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.