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Finding the Fourth Proportional to 128,400.60, 192,600.90 and 86,410.20

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Solution

The fourth proportional to 128,400.60, 192,600.90 and 86,410.20 is: 129,615.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,400.60 : 192,600.90 = 86,410.20 : x
  2. Step 2: Convert to fraction form
    128,400.60/192,600.90 = 86,410.20/x
  3. Step 3: Cross multiply
    128,400.60x = 192,600.90 × 86,410.20
  4. Step 4: Simplify right side
    128,400.60x = 16,642,682,289.18
  5. Step 5: Solve for x
    x = 16,642,682,289.18/128,400.60
  6. Step 6: Final answer
    x = 129,615.30

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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.