Home / 126,000.20-189,000.30-81,385.40

Finding the Fourth Proportional to 126,000.20, 189,000.30 and 81,385.40

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Solution

The fourth proportional to 126,000.20, 189,000.30 and 81,385.40 is: 122,078.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    126,000.20 : 189,000.30 = 81,385.40 : x
  2. Step 2: Convert to fraction form
    126,000.20/189,000.30 = 81,385.40/x
  3. Step 3: Cross multiply
    126,000.20x = 189,000.30 × 81,385.40
  4. Step 4: Simplify right side
    126,000.20x = 15,381,865,015.62
  5. Step 5: Solve for x
    x = 15,381,865,015.62/126,000.20
  6. Step 6: Final answer
    x = 122,078.10

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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.