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Finding the Fourth Proportional to 391,779.88, 587,743.58 and 279,180.76

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Solution

The fourth proportional to 391,779.88, 587,743.58 and 279,180.76 is: 418,823.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,779.88 : 587,743.58 = 279,180.76 : x
  2. Step 2: Convert to fraction form
    391,779.88/587,743.58 = 279,180.76/x
  3. Step 3: Cross multiply
    391,779.88x = 587,743.58 × 279,180.76
  4. Step 4: Simplify right side
    391,779.88x = 164,086,699,349.52
  5. Step 5: Solve for x
    x = 164,086,699,349.52/391,779.88
  6. Step 6: Final answer
    x = 418,823.70

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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.