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Finding the Fourth Proportional to 128,376.43, 177,158.43 and 71,787.80

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Solution

The fourth proportional to 128,376.43, 177,158.43 and 71,787.80 is: 99,066.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,376.43 : 177,158.43 = 71,787.80 : x
  2. Step 2: Convert to fraction form
    128,376.43/177,158.43 = 71,787.80/x
  3. Step 3: Cross multiply
    128,376.43x = 177,158.43 × 71,787.80
  4. Step 4: Simplify right side
    128,376.43x = 12,717,814,384.05
  5. Step 5: Solve for x
    x = 12,717,814,384.05/128,376.43
  6. Step 6: Final answer
    x = 99,066.59

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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.