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Finding the Fourth Proportional to 132,665.80, 198,480.30 and 86,009.80

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Solution

The fourth proportional to 132,665.80, 198,480.30 and 86,009.80 is: 128,678.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    132,665.80 : 198,480.30 = 86,009.80 : x
  2. Step 2: Convert to fraction form
    132,665.80/198,480.30 = 86,009.80/x
  3. Step 3: Cross multiply
    132,665.80x = 198,480.30 × 86,009.80
  4. Step 4: Simplify right side
    132,665.80x = 17,071,250,906.94
  5. Step 5: Solve for x
    x = 17,071,250,906.94/132,665.80
  6. Step 6: Final answer
    x = 128,678.61

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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.