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Finding the Fourth Proportional to 128,527.40, 192,791.10 and 83,426.60

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Solution

The fourth proportional to 128,527.40, 192,791.10 and 83,426.60 is: 125,139.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,527.40 : 192,791.10 = 83,426.60 : x
  2. Step 2: Convert to fraction form
    128,527.40/192,791.10 = 83,426.60/x
  3. Step 3: Cross multiply
    128,527.40x = 192,791.10 × 83,426.60
  4. Step 4: Simplify right side
    128,527.40x = 16,083,905,983.26
  5. Step 5: Solve for x
    x = 16,083,905,983.26/128,527.40
  6. Step 6: Final answer
    x = 125,139.90

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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.