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Finding the Fourth Proportional to 215,661.78, 323,380.89 and 65,871.72

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Solution

The fourth proportional to 215,661.78, 323,380.89 and 65,871.72 is: 98,773.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    215,661.78 : 323,380.89 = 65,871.72 : x
  2. Step 2: Convert to fraction form
    215,661.78/323,380.89 = 65,871.72/x
  3. Step 3: Cross multiply
    215,661.78x = 323,380.89 × 65,871.72
  4. Step 4: Simplify right side
    215,661.78x = 21,301,655,439.43
  5. Step 5: Solve for x
    x = 21,301,655,439.43/215,661.78
  6. Step 6: Final answer
    x = 98,773.44

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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.