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Finding the Fourth Proportional to 128,047.40, 192,071.10 and 120,789.80

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Solution

The fourth proportional to 128,047.40, 192,071.10 and 120,789.80 is: 181,184.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,047.40 : 192,071.10 = 120,789.80 : x
  2. Step 2: Convert to fraction form
    128,047.40/192,071.10 = 120,789.80/x
  3. Step 3: Cross multiply
    128,047.40x = 192,071.10 × 120,789.80
  4. Step 4: Simplify right side
    128,047.40x = 23,200,229,754.78
  5. Step 5: Solve for x
    x = 23,200,229,754.78/128,047.40
  6. Step 6: Final answer
    x = 181,184.70

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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.