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Finding the Fourth Proportional to 128,440.50, 177,243.87 and 71,076.36

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Solution

The fourth proportional to 128,440.50, 177,243.87 and 71,076.36 is: 98,083.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,440.50 : 177,243.87 = 71,076.36 : x
  2. Step 2: Convert to fraction form
    128,440.50/177,243.87 = 71,076.36/x
  3. Step 3: Cross multiply
    128,440.50x = 177,243.87 × 71,076.36
  4. Step 4: Simplify right side
    128,440.50x = 12,597,849,111.91
  5. Step 5: Solve for x
    x = 12,597,849,111.91/128,440.50
  6. Step 6: Final answer
    x = 98,083.15

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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.