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Finding the Fourth Proportional to 128,435.70, 192,583.53 and 39,672.66

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Solution

The fourth proportional to 128,435.70, 192,583.53 and 39,672.66 is: 59,487.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,435.70 : 192,583.53 = 39,672.66 : x
  2. Step 2: Convert to fraction form
    128,435.70/192,583.53 = 39,672.66/x
  3. Step 3: Cross multiply
    128,435.70x = 192,583.53 × 39,672.66
  4. Step 4: Simplify right side
    128,435.70x = 7,640,300,907.29
  5. Step 5: Solve for x
    x = 7,640,300,907.29/128,435.70
  6. Step 6: Final answer
    x = 59,487.36

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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.