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Finding the Fourth Proportional to 128,658.20, 193,005.99 and 39,918.78

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Solution

The fourth proportional to 128,658.20, 193,005.99 and 39,918.78 is: 59,883.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,658.20 : 193,005.99 = 39,918.78 : x
  2. Step 2: Convert to fraction form
    128,658.20/193,005.99 = 39,918.78/x
  3. Step 3: Cross multiply
    128,658.20x = 193,005.99 × 39,918.78
  4. Step 4: Simplify right side
    128,658.20x = 7,704,563,653.49
  5. Step 5: Solve for x
    x = 7,704,563,653.49/128,658.20
  6. Step 6: Final answer
    x = 59,883.97

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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.