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Finding the Fourth Proportional to 128,000.30, 192,000.45 and 81,305.90

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Solution

The fourth proportional to 128,000.30, 192,000.45 and 81,305.90 is: 121,958.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,000.30 : 192,000.45 = 81,305.90 : x
  2. Step 2: Convert to fraction form
    128,000.30/192,000.45 = 81,305.90/x
  3. Step 3: Cross multiply
    128,000.30x = 192,000.45 × 81,305.90
  4. Step 4: Simplify right side
    128,000.30x = 15,610,769,387.66
  5. Step 5: Solve for x
    x = 15,610,769,387.66/128,000.30
  6. Step 6: Final answer
    x = 121,958.85

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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.