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Finding the Fourth Proportional to 398,787.19, 550,015.14 and 255,560.56

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Solution

The fourth proportional to 398,787.19, 550,015.14 and 255,560.56 is: 352,474.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,787.19 : 550,015.14 = 255,560.56 : x
  2. Step 2: Convert to fraction form
    398,787.19/550,015.14 = 255,560.56/x
  3. Step 3: Cross multiply
    398,787.19x = 550,015.14 × 255,560.56
  4. Step 4: Simplify right side
    398,787.19x = 140,562,177,186.88
  5. Step 5: Solve for x
    x = 140,562,177,186.88/398,787.19
  6. Step 6: Final answer
    x = 352,474.15

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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.