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Finding the Fourth Proportional to 485,963.90, 728,896.64 and 131,013.80

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Solution

The fourth proportional to 485,963.90, 728,896.64 and 131,013.80 is: 196,507.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,963.90 : 728,896.64 = 131,013.80 : x
  2. Step 2: Convert to fraction form
    485,963.90/728,896.64 = 131,013.80/x
  3. Step 3: Cross multiply
    485,963.90x = 728,896.64 × 131,013.80
  4. Step 4: Simplify right side
    485,963.90x = 95,495,519,780.80
  5. Step 5: Solve for x
    x = 95,495,519,780.80/485,963.90
  6. Step 6: Final answer
    x = 196,507.43

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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.