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Finding the Fourth Proportional to 128,755.54, 177,688.31 and 71,391.21

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Solution

The fourth proportional to 128,755.54, 177,688.31 and 71,391.21 is: 98,523.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,755.54 : 177,688.31 = 71,391.21 : x
  2. Step 2: Convert to fraction form
    128,755.54/177,688.31 = 71,391.21/x
  3. Step 3: Cross multiply
    128,755.54x = 177,688.31 × 71,391.21
  4. Step 4: Simplify right side
    128,755.54x = 12,685,383,453.76
  5. Step 5: Solve for x
    x = 12,685,383,453.76/128,755.54
  6. Step 6: Final answer
    x = 98,523.01

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1.5x scale

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.