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Finding the Fourth Proportional to 128,747.84, 193,175.09 and 69,513.89

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Solution

The fourth proportional to 128,747.84, 193,175.09 and 69,513.89 is: 104,299.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,747.84 : 193,175.09 = 69,513.89 : x
  2. Step 2: Convert to fraction form
    128,747.84/193,175.09 = 69,513.89/x
  3. Step 3: Cross multiply
    128,747.84x = 193,175.09 × 69,513.89
  4. Step 4: Simplify right side
    128,747.84x = 13,428,351,957.00
  5. Step 5: Solve for x
    x = 13,428,351,957.00/128,747.84
  6. Step 6: Final answer
    x = 104,299.63

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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.