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Finding the Fourth Proportional to 1,389,744.72, 1,917,829.44 and 786,132.72

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Solution

The fourth proportional to 1,389,744.72, 1,917,829.44 and 786,132.72 is: 1,084,852.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,389,744.72 : 1,917,829.44 = 786,132.72 : x
  2. Step 2: Convert to fraction form
    1,389,744.72/1,917,829.44 = 786,132.72/x
  3. Step 3: Cross multiply
    1,389,744.72x = 1,917,829.44 × 786,132.72
  4. Step 4: Simplify right side
    1,389,744.72x = 1,507,668,474,163.28
  5. Step 5: Solve for x
    x = 1,507,668,474,163.28/1,389,744.72
  6. Step 6: Final answer
    x = 1,084,852.82

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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.