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Finding the Fourth Proportional to 85,200.60, 127,800.90 and 76,015.20

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Solution

The fourth proportional to 85,200.60, 127,800.90 and 76,015.20 is: 114,022.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,200.60 : 127,800.90 = 76,015.20 : x
  2. Step 2: Convert to fraction form
    85,200.60/127,800.90 = 76,015.20/x
  3. Step 3: Cross multiply
    85,200.60x = 127,800.90 × 76,015.20
  4. Step 4: Simplify right side
    85,200.60x = 9,714,810,973.68
  5. Step 5: Solve for x
    x = 9,714,810,973.68/85,200.60
  6. Step 6: Final answer
    x = 114,022.80

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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.