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Finding the Fourth Proportional to 211,805.79, 317,770.18 and 85,380.79

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Solution

The fourth proportional to 211,805.79, 317,770.18 and 85,380.79 is: 128,095.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    211,805.79 : 317,770.18 = 85,380.79 : x
  2. Step 2: Convert to fraction form
    211,805.79/317,770.18 = 85,380.79/x
  3. Step 3: Cross multiply
    211,805.79x = 317,770.18 × 85,380.79
  4. Step 4: Simplify right side
    211,805.79x = 27,131,467,998.96
  5. Step 5: Solve for x
    x = 27,131,467,998.96/211,805.79
  6. Step 6: Final answer
    x = 128,095.97

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1.5x scale

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.