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Finding the Fourth Proportional to 128,787.84, 193,148.96 and 39,995.64

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Solution

The fourth proportional to 128,787.84, 193,148.96 and 39,995.64 is: 59,983.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,787.84 : 193,148.96 = 39,995.64 : x
  2. Step 2: Convert to fraction form
    128,787.84/193,148.96 = 39,995.64/x
  3. Step 3: Cross multiply
    128,787.84x = 193,148.96 × 39,995.64
  4. Step 4: Simplify right side
    128,787.84x = 7,725,116,070.56
  5. Step 5: Solve for x
    x = 7,725,116,070.56/128,787.84
  6. Step 6: Final answer
    x = 59,983.27

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.