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Finding the Fourth Proportional to 394,720.65, 592,086.51 and 128,482.56

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Solution

The fourth proportional to 394,720.65, 592,086.51 and 128,482.56 is: 192,725.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    394,720.65 : 592,086.51 = 128,482.56 : x
  2. Step 2: Convert to fraction form
    394,720.65/592,086.51 = 128,482.56/x
  3. Step 3: Cross multiply
    394,720.65x = 592,086.51 × 128,482.56
  4. Step 4: Simplify right side
    394,720.65x = 76,072,790,546.27
  5. Step 5: Solve for x
    x = 76,072,790,546.27/394,720.65
  6. Step 6: Final answer
    x = 192,725.64

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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.