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Finding the Fourth Proportional to 128,138.08, 176,783.70 and 80,374

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Solution

The fourth proportional to 128,138.08, 176,783.70 and 80,374 is: 110,886.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,138.08 : 176,783.70 = 80,374 : x
  2. Step 2: Convert to fraction form
    128,138.08/176,783.70 = 80,374/x
  3. Step 3: Cross multiply
    128,138.08x = 176,783.70 × 80,374
  4. Step 4: Simplify right side
    128,138.08x = 14,208,813,103.80
  5. Step 5: Solve for x
    x = 14,208,813,103.80/128,138.08
  6. Step 6: Final answer
    x = 110,886.73

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.