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Finding the Fourth Proportional to 128,787.36, 177,722.52 and 75,074.64

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Solution

The fourth proportional to 128,787.36, 177,722.52 and 75,074.64 is: 103,600.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,787.36 : 177,722.52 = 75,074.64 : x
  2. Step 2: Convert to fraction form
    128,787.36/177,722.52 = 75,074.64/x
  3. Step 3: Cross multiply
    128,787.36x = 177,722.52 × 75,074.64
  4. Step 4: Simplify right side
    128,787.36x = 13,342,454,208.89
  5. Step 5: Solve for x
    x = 13,342,454,208.89/128,787.36
  6. Step 6: Final answer
    x = 103,600.65

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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.