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Finding the Fourth Proportional to 391,008, 539,591.04 and 212,160

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Solution

The fourth proportional to 391,008, 539,591.04 and 212,160 is: 292,780.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,008 : 539,591.04 = 212,160 : x
  2. Step 2: Convert to fraction form
    391,008/539,591.04 = 212,160/x
  3. Step 3: Cross multiply
    391,008x = 539,591.04 × 212,160
  4. Step 4: Simplify right side
    391,008x = 114,479,635,046.40
  5. Step 5: Solve for x
    x = 114,479,635,046.40/391,008
  6. Step 6: Final answer
    x = 292,780.80

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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.