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Finding the Fourth Proportional to 399,789.80, 599,788.55 and 119,307.05

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Solution

The fourth proportional to 399,789.80, 599,788.55 and 119,307.05 is: 178,991.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,789.80 : 599,788.55 = 119,307.05 : x
  2. Step 2: Convert to fraction form
    399,789.80/599,788.55 = 119,307.05/x
  3. Step 3: Cross multiply
    399,789.80x = 599,788.55 × 119,307.05
  4. Step 4: Simplify right side
    399,789.80x = 71,559,002,524.28
  5. Step 5: Solve for x
    x = 71,559,002,524.28/399,789.80
  6. Step 6: Final answer
    x = 178,991.57

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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.