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Finding the Fourth Proportional to 290,986.38, 436,498.04 and 91,314.65

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Solution

The fourth proportional to 290,986.38, 436,498.04 and 91,314.65 is: 136,977.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    290,986.38 : 436,498.04 = 91,314.65 : x
  2. Step 2: Convert to fraction form
    290,986.38/436,498.04 = 91,314.65/x
  3. Step 3: Cross multiply
    290,986.38x = 436,498.04 × 91,314.65
  4. Step 4: Simplify right side
    290,986.38x = 39,858,667,067.82
  5. Step 5: Solve for x
    x = 39,858,667,067.82/290,986.38
  6. Step 6: Final answer
    x = 136,977.78

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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.