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Finding the Fourth Proportional to 85,544.60, 128,535.60 and 75,921.80

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Solution

The fourth proportional to 85,544.60, 128,535.60 and 75,921.80 is: 114,076.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,544.60 : 128,535.60 = 75,921.80 : x
  2. Step 2: Convert to fraction form
    85,544.60/128,535.60 = 75,921.80/x
  3. Step 3: Cross multiply
    85,544.60x = 128,535.60 × 75,921.80
  4. Step 4: Simplify right side
    85,544.60x = 9,758,654,116.08
  5. Step 5: Solve for x
    x = 9,758,654,116.08/85,544.60
  6. Step 6: Final answer
    x = 114,076.80

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1.5x scale

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.