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Finding the Fourth Proportional to 485,709.51, 728,725.61 and 215,800.10

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Solution

The fourth proportional to 485,709.51, 728,725.61 and 215,800.10 is: 323,771.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,709.51 : 728,725.61 = 215,800.10 : x
  2. Step 2: Convert to fraction form
    485,709.51/728,725.61 = 215,800.10/x
  3. Step 3: Cross multiply
    485,709.51x = 728,725.61 × 215,800.10
  4. Step 4: Simplify right side
    485,709.51x = 157,259,059,139.15
  5. Step 5: Solve for x
    x = 157,259,059,139.15/485,709.51
  6. Step 6: Final answer
    x = 323,771.83

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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.