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Finding the Fourth Proportional to 128,218.90, 192,486.30 and 80,833.90

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Solution

The fourth proportional to 128,218.90, 192,486.30 and 80,833.90 is: 121,350.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,218.90 : 192,486.30 = 80,833.90 : x
  2. Step 2: Convert to fraction form
    128,218.90/192,486.30 = 80,833.90/x
  3. Step 3: Cross multiply
    128,218.90x = 192,486.30 × 80,833.90
  4. Step 4: Simplify right side
    128,218.90x = 15,559,418,325.57
  5. Step 5: Solve for x
    x = 15,559,418,325.57/128,218.90
  6. Step 6: Final answer
    x = 121,350.43

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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.