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Finding the Fourth Proportional to 391,057.94, 539,659.96 and 212,209.94

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Solution

The fourth proportional to 391,057.94, 539,659.96 and 212,209.94 is: 292,849.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,057.94 : 539,659.96 = 212,209.94 : x
  2. Step 2: Convert to fraction form
    391,057.94/539,659.96 = 212,209.94/x
  3. Step 3: Cross multiply
    391,057.94x = 539,659.96 × 212,209.94
  4. Step 4: Simplify right side
    391,057.94x = 114,521,207,732.00
  5. Step 5: Solve for x
    x = 114,521,207,732.00/391,057.94
  6. Step 6: Final answer
    x = 292,849.72

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.