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Finding the Fourth Proportional to 128,467.20, 192,643.20 and 49,555.20

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Solution

The fourth proportional to 128,467.20, 192,643.20 and 49,555.20 is: 74,310.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,467.20 : 192,643.20 = 49,555.20 : x
  2. Step 2: Convert to fraction form
    128,467.20/192,643.20 = 49,555.20/x
  3. Step 3: Cross multiply
    128,467.20x = 192,643.20 × 49,555.20
  4. Step 4: Simplify right side
    128,467.20x = 9,546,472,304.64
  5. Step 5: Solve for x
    x = 9,546,472,304.64/128,467.20
  6. Step 6: Final answer
    x = 74,310.58

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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.