Home / 128,977.43-177,988.85-72,388.80

Finding the Fourth Proportional to 128,977.43, 177,988.85 and 72,388.80

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Solution

The fourth proportional to 128,977.43, 177,988.85 and 72,388.80 is: 99,896.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,977.43 : 177,988.85 = 72,388.80 : x
  2. Step 2: Convert to fraction form
    128,977.43/177,988.85 = 72,388.80/x
  3. Step 3: Cross multiply
    128,977.43x = 177,988.85 × 72,388.80
  4. Step 4: Simplify right side
    128,977.43x = 12,884,398,902.94
  5. Step 5: Solve for x
    x = 12,884,398,902.94/128,977.43
  6. Step 6: Final answer
    x = 99,896.54

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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.