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Finding the Fourth Proportional to 128,576.39, 192,790.70 and 68,530.91

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Solution

The fourth proportional to 128,576.39, 192,790.70 and 68,530.91 is: 102,756.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,576.39 : 192,790.70 = 68,530.91 : x
  2. Step 2: Convert to fraction form
    128,576.39/192,790.70 = 68,530.91/x
  3. Step 3: Cross multiply
    128,576.39x = 192,790.70 × 68,530.91
  4. Step 4: Simplify right side
    128,576.39x = 13,212,121,767.88
  5. Step 5: Solve for x
    x = 13,212,121,767.88/128,576.39
  6. Step 6: Final answer
    x = 102,756.98

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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.