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Finding the Fourth Proportional to 85,839.60, 128,759.40 and 72,879.60

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Solution

The fourth proportional to 85,839.60, 128,759.40 and 72,879.60 is: 109,319.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,839.60 : 128,759.40 = 72,879.60 : x
  2. Step 2: Convert to fraction form
    85,839.60/128,759.40 = 72,879.60/x
  3. Step 3: Cross multiply
    85,839.60x = 128,759.40 × 72,879.60
  4. Step 4: Simplify right side
    85,839.60x = 9,383,933,568.24
  5. Step 5: Solve for x
    x = 9,383,933,568.24/85,839.60
  6. Step 6: Final answer
    x = 109,319.40

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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.