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Finding the Fourth Proportional to 128,259.91, 176,998.39 and 71,671.29

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Solution

The fourth proportional to 128,259.91, 176,998.39 and 71,671.29 is: 98,906.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,259.91 : 176,998.39 = 71,671.29 : x
  2. Step 2: Convert to fraction form
    128,259.91/176,998.39 = 71,671.29/x
  3. Step 3: Cross multiply
    128,259.91x = 176,998.39 × 71,671.29
  4. Step 4: Simplify right side
    128,259.91x = 12,685,702,939.22
  5. Step 5: Solve for x
    x = 12,685,702,939.22/128,259.91
  6. Step 6: Final answer
    x = 98,906.22

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.