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Finding the Fourth Proportional to 128,787.82, 177,813.48 and 80,463.31

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Solution

The fourth proportional to 128,787.82, 177,813.48 and 80,463.31 is: 111,093.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,787.82 : 177,813.48 = 80,463.31 : x
  2. Step 2: Convert to fraction form
    128,787.82/177,813.48 = 80,463.31/x
  3. Step 3: Cross multiply
    128,787.82x = 177,813.48 × 80,463.31
  4. Step 4: Simplify right side
    128,787.82x = 14,307,461,163.42
  5. Step 5: Solve for x
    x = 14,307,461,163.42/128,787.82
  6. Step 6: Final answer
    x = 111,093.28

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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.