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Finding the Fourth Proportional to 128,984.33, 178,009.56 and 71,634.71

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Solution

The fourth proportional to 128,984.33, 178,009.56 and 71,634.71 is: 98,862.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,984.33 : 178,009.56 = 71,634.71 : x
  2. Step 2: Convert to fraction form
    128,984.33/178,009.56 = 71,634.71/x
  3. Step 3: Cross multiply
    128,984.33x = 178,009.56 × 71,634.71
  4. Step 4: Simplify right side
    128,984.33x = 12,751,663,207.83
  5. Step 5: Solve for x
    x = 12,751,663,207.83/128,984.33
  6. Step 6: Final answer
    x = 98,862.11

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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.