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Finding the Fourth Proportional to 128,443.74, 192,594.87 and 39,672.60

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Solution

The fourth proportional to 128,443.74, 192,594.87 and 39,672.60 is: 59,487.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,443.74 : 192,594.87 = 39,672.60 : x
  2. Step 2: Convert to fraction form
    128,443.74/192,594.87 = 39,672.60/x
  3. Step 3: Cross multiply
    128,443.74x = 192,594.87 × 39,672.60
  4. Step 4: Simplify right side
    128,443.74x = 7,640,739,239.56
  5. Step 5: Solve for x
    x = 7,640,739,239.56/128,443.74
  6. Step 6: Final answer
    x = 59,487.05

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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.