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Finding the Fourth Proportional to 128,609.65, 192,960.87 and 68,574.98

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Solution

The fourth proportional to 128,609.65, 192,960.87 and 68,574.98 is: 102,887.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,609.65 : 192,960.87 = 68,574.98 : x
  2. Step 2: Convert to fraction form
    128,609.65/192,960.87 = 68,574.98/x
  3. Step 3: Cross multiply
    128,609.65x = 192,960.87 × 68,574.98
  4. Step 4: Simplify right side
    128,609.65x = 13,232,287,772.88
  5. Step 5: Solve for x
    x = 13,232,287,772.88/128,609.65
  6. Step 6: Final answer
    x = 102,887.21

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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.