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Finding the Fourth Proportional to 128,015.60, 192,023.40 and 86,025.20

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Solution

The fourth proportional to 128,015.60, 192,023.40 and 86,025.20 is: 129,037.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,015.60 : 192,023.40 = 86,025.20 : x
  2. Step 2: Convert to fraction form
    128,015.60/192,023.40 = 86,025.20/x
  3. Step 3: Cross multiply
    128,015.60x = 192,023.40 × 86,025.20
  4. Step 4: Simplify right side
    128,015.60x = 16,518,851,389.68
  5. Step 5: Solve for x
    x = 16,518,851,389.68/128,015.60
  6. Step 6: Final answer
    x = 129,037.80

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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.