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Finding the Fourth Proportional to 485,911.77, 729,078.16 and 261,009.80

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Solution

The fourth proportional to 485,911.77, 729,078.16 and 261,009.80 is: 391,627.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,911.77 : 729,078.16 = 261,009.80 : x
  2. Step 2: Convert to fraction form
    485,911.77/729,078.16 = 261,009.80/x
  3. Step 3: Cross multiply
    485,911.77x = 729,078.16 × 261,009.80
  4. Step 4: Simplify right side
    485,911.77x = 190,296,544,725.97
  5. Step 5: Solve for x
    x = 190,296,544,725.97/485,911.77
  6. Step 6: Final answer
    x = 391,627.77

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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.