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Finding the Fourth Proportional to 391,057.88, 539,659.87 and 212,209.88

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Solution

The fourth proportional to 391,057.88, 539,659.87 and 212,209.88 is: 292,849.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,057.88 : 539,659.87 = 212,209.88 : x
  2. Step 2: Convert to fraction form
    391,057.88/539,659.87 = 212,209.88/x
  3. Step 3: Cross multiply
    391,057.88x = 539,659.87 × 212,209.88
  4. Step 4: Simplify right side
    391,057.88x = 114,521,153,024.69
  5. Step 5: Solve for x
    x = 114,521,153,024.69/391,057.88
  6. Step 6: Final answer
    x = 292,849.63

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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.