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Finding the Fourth Proportional to 128,186.78, 192,311.89 and 53,284.46

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Solution

The fourth proportional to 128,186.78, 192,311.89 and 53,284.46 is: 79,939.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,186.78 : 192,311.89 = 53,284.46 : x
  2. Step 2: Convert to fraction form
    128,186.78/192,311.89 = 53,284.46/x
  3. Step 3: Cross multiply
    128,186.78x = 192,311.89 × 53,284.46
  4. Step 4: Simplify right side
    128,186.78x = 10,247,235,210.23
  5. Step 5: Solve for x
    x = 10,247,235,210.23/128,186.78
  6. Step 6: Final answer
    x = 79,939.88

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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.