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Finding the Fourth Proportional to 128,511.90, 192,796.65 and 49,619.10

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Solution

The fourth proportional to 128,511.90, 192,796.65 and 49,619.10 is: 74,439.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,511.90 : 192,796.65 = 49,619.10 : x
  2. Step 2: Convert to fraction form
    128,511.90/192,796.65 = 49,619.10/x
  3. Step 3: Cross multiply
    128,511.90x = 192,796.65 × 49,619.10
  4. Step 4: Simplify right side
    128,511.90x = 9,566,396,256.02
  5. Step 5: Solve for x
    x = 9,566,396,256.02/128,511.90
  6. Step 6: Final answer
    x = 74,439.77

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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.