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Finding the Fourth Proportional to 128,685.48, 193,053.73 and 39,935.20

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Solution

The fourth proportional to 128,685.48, 193,053.73 and 39,935.20 is: 59,910.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,685.48 : 193,053.73 = 39,935.20 : x
  2. Step 2: Convert to fraction form
    128,685.48/193,053.73 = 39,935.20/x
  3. Step 3: Cross multiply
    128,685.48x = 193,053.73 × 39,935.20
  4. Step 4: Simplify right side
    128,685.48x = 7,709,638,353.03
  5. Step 5: Solve for x
    x = 7,709,638,353.03/128,685.48
  6. Step 6: Final answer
    x = 59,910.71

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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.