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Finding the Fourth Proportional to 485,472.78, 728,208.11 and 130,486.79

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Solution

The fourth proportional to 485,472.78, 728,208.11 and 130,486.79 is: 195,729.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,472.78 : 728,208.11 = 130,486.79 : x
  2. Step 2: Convert to fraction form
    485,472.78/728,208.11 = 130,486.79/x
  3. Step 3: Cross multiply
    485,472.78x = 728,208.11 × 130,486.79
  4. Step 4: Simplify right side
    485,472.78x = 95,021,540,872.60
  5. Step 5: Solve for x
    x = 95,021,540,872.60/485,472.78
  6. Step 6: Final answer
    x = 195,729.90

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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.