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Finding the Fourth Proportional to 211,043.43, 316,469.46 and 91,043.79

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Solution

The fourth proportional to 211,043.43, 316,469.46 and 91,043.79 is: 136,524.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    211,043.43 : 316,469.46 = 91,043.79 : x
  2. Step 2: Convert to fraction form
    211,043.43/316,469.46 = 91,043.79/x
  3. Step 3: Cross multiply
    211,043.43x = 316,469.46 × 91,043.79
  4. Step 4: Simplify right side
    211,043.43x = 28,812,579,057.65
  5. Step 5: Solve for x
    x = 28,812,579,057.65/211,043.43
  6. Step 6: Final answer
    x = 136,524.41

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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.