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Finding the Fourth Proportional to 128,434.80, 192,666.60 and 39,687.60

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Solution

The fourth proportional to 128,434.80, 192,666.60 and 39,687.60 is: 59,535.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,434.80 : 192,666.60 = 39,687.60 : x
  2. Step 2: Convert to fraction form
    128,434.80/192,666.60 = 39,687.60/x
  3. Step 3: Cross multiply
    128,434.80x = 192,666.60 × 39,687.60
  4. Step 4: Simplify right side
    128,434.80x = 7,646,474,954.16
  5. Step 5: Solve for x
    x = 7,646,474,954.16/128,434.80
  6. Step 6: Final answer
    x = 59,535.85

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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.