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Finding the Fourth Proportional to 128,580.50, 177,440.89 and 71,991.88

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Solution

The fourth proportional to 128,580.50, 177,440.89 and 71,991.88 is: 99,348.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,580.50 : 177,440.89 = 71,991.88 : x
  2. Step 2: Convert to fraction form
    128,580.50/177,440.89 = 71,991.88/x
  3. Step 3: Cross multiply
    128,580.50x = 177,440.89 × 71,991.88
  4. Step 4: Simplify right side
    128,580.50x = 12,774,303,259.97
  5. Step 5: Solve for x
    x = 12,774,303,259.97/128,580.50
  6. Step 6: Final answer
    x = 99,348.68

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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.