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Finding the Fourth Proportional to 128,386.50, 177,170.04 and 71,027.94

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Solution

The fourth proportional to 128,386.50, 177,170.04 and 71,027.94 is: 98,016.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,386.50 : 177,170.04 = 71,027.94 : x
  2. Step 2: Convert to fraction form
    128,386.50/177,170.04 = 71,027.94/x
  3. Step 3: Cross multiply
    128,386.50x = 177,170.04 × 71,027.94
  4. Step 4: Simplify right side
    128,386.50x = 12,584,022,970.92
  5. Step 5: Solve for x
    x = 12,584,022,970.92/128,386.50
  6. Step 6: Final answer
    x = 98,016.71

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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.