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Finding the Fourth Proportional to 328,540.40, 492,713.40 and 128,745.80

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Solution

The fourth proportional to 328,540.40, 492,713.40 and 128,745.80 is: 193,080.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    328,540.40 : 492,713.40 = 128,745.80 : x
  2. Step 2: Convert to fraction form
    328,540.40/492,713.40 = 128,745.80/x
  3. Step 3: Cross multiply
    328,540.40x = 492,713.40 × 128,745.80
  4. Step 4: Simplify right side
    328,540.40x = 63,434,780,853.72
  5. Step 5: Solve for x
    x = 63,434,780,853.72/328,540.40
  6. Step 6: Final answer
    x = 193,080.61

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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.