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Finding the Fourth Proportional to 407,963.47, 611,945.09 and 127,480.72

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Solution

The fourth proportional to 407,963.47, 611,945.09 and 127,480.72 is: 191,221.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    407,963.47 : 611,945.09 = 127,480.72 : x
  2. Step 2: Convert to fraction form
    407,963.47/611,945.09 = 127,480.72/x
  3. Step 3: Cross multiply
    407,963.47x = 611,945.09 × 127,480.72
  4. Step 4: Simplify right side
    407,963.47x = 78,011,200,673.66
  5. Step 5: Solve for x
    x = 78,011,200,673.66/407,963.47
  6. Step 6: Final answer
    x = 191,221.04

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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.