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Finding the Fourth Proportional to 85,551.60, 128,546.10 and 75,928.80

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Solution

The fourth proportional to 85,551.60, 128,546.10 and 75,928.80 is: 114,087.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,551.60 : 128,546.10 = 75,928.80 : x
  2. Step 2: Convert to fraction form
    85,551.60/128,546.10 = 75,928.80/x
  3. Step 3: Cross multiply
    85,551.60x = 128,546.10 × 75,928.80
  4. Step 4: Simplify right side
    85,551.60x = 9,760,351,117.68
  5. Step 5: Solve for x
    x = 9,760,351,117.68/85,551.60
  6. Step 6: Final answer
    x = 114,087.30

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.