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Finding the Fourth Proportional to 215,909.66, 323,786.73 and 91,260.38

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Solution

The fourth proportional to 215,909.66, 323,786.73 and 91,260.38 is: 136,857.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    215,909.66 : 323,786.73 = 91,260.38 : x
  2. Step 2: Convert to fraction form
    215,909.66/323,786.73 = 91,260.38/x
  3. Step 3: Cross multiply
    215,909.66x = 323,786.73 × 91,260.38
  4. Step 4: Simplify right side
    215,909.66x = 29,548,900,018.76
  5. Step 5: Solve for x
    x = 29,548,900,018.76/215,909.66
  6. Step 6: Final answer
    x = 136,857.70

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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.