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Finding the Fourth Proportional to 485,911.52, 729,077.78 and 261,009.55

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Solution

The fourth proportional to 485,911.52, 729,077.78 and 261,009.55 is: 391,627.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,911.52 : 729,077.78 = 261,009.55 : x
  2. Step 2: Convert to fraction form
    485,911.52/729,077.78 = 261,009.55/x
  3. Step 3: Cross multiply
    485,911.52x = 729,077.78 × 261,009.55
  4. Step 4: Simplify right side
    485,911.52x = 190,296,262,102.63
  5. Step 5: Solve for x
    x = 190,296,262,102.63/485,911.52
  6. Step 6: Final answer
    x = 391,627.40

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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.