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Finding the Fourth Proportional to 326,021.40, 489,007.80 and 136,432.80

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Solution

The fourth proportional to 326,021.40, 489,007.80 and 136,432.80 is: 204,639.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    326,021.40 : 489,007.80 = 136,432.80 : x
  2. Step 2: Convert to fraction form
    326,021.40/489,007.80 = 136,432.80/x
  3. Step 3: Cross multiply
    326,021.40x = 489,007.80 × 136,432.80
  4. Step 4: Simplify right side
    326,021.40x = 66,716,703,375.84
  5. Step 5: Solve for x
    x = 66,716,703,375.84/326,021.40
  6. Step 6: Final answer
    x = 204,639.03

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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.