Home / 128,380.50-177,161.76-71,021.94

Finding the Fourth Proportional to 128,380.50, 177,161.76 and 71,021.94

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Solution

The fourth proportional to 128,380.50, 177,161.76 and 71,021.94 is: 98,008.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,380.50 : 177,161.76 = 71,021.94 : x
  2. Step 2: Convert to fraction form
    128,380.50/177,161.76 = 71,021.94/x
  3. Step 3: Cross multiply
    128,380.50x = 177,161.76 × 71,021.94
  4. Step 4: Simplify right side
    128,380.50x = 12,582,371,889.01
  5. Step 5: Solve for x
    x = 12,582,371,889.01/128,380.50
  6. Step 6: Final answer
    x = 98,008.43

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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.