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Finding the Fourth Proportional to 128,540.40, 192,810.60 and 45,434.40

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Solution

The fourth proportional to 128,540.40, 192,810.60 and 45,434.40 is: 68,151.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,540.40 : 192,810.60 = 45,434.40 : x
  2. Step 2: Convert to fraction form
    128,540.40/192,810.60 = 45,434.40/x
  3. Step 3: Cross multiply
    128,540.40x = 192,810.60 × 45,434.40
  4. Step 4: Simplify right side
    128,540.40x = 8,760,233,924.64
  5. Step 5: Solve for x
    x = 8,760,233,924.64/128,540.40
  6. Step 6: Final answer
    x = 68,151.60

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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.