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Finding the Fourth Proportional to 128,321.36, 192,648.43 and 85,898.20

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Solution

The fourth proportional to 128,321.36, 192,648.43 and 85,898.20 is: 128,958.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,321.36 : 192,648.43 = 85,898.20 : x
  2. Step 2: Convert to fraction form
    128,321.36/192,648.43 = 85,898.20/x
  3. Step 3: Cross multiply
    128,321.36x = 192,648.43 × 85,898.20
  4. Step 4: Simplify right side
    128,321.36x = 16,548,153,369.83
  5. Step 5: Solve for x
    x = 16,548,153,369.83/128,321.36
  6. Step 6: Final answer
    x = 128,958.68

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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.