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Finding the Fourth Proportional to 290,919.99, 436,379.78 and 91,255.80

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Solution

The fourth proportional to 290,919.99, 436,379.78 and 91,255.80 is: 136,883.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    290,919.99 : 436,379.78 = 91,255.80 : x
  2. Step 2: Convert to fraction form
    290,919.99/436,379.78 = 91,255.80/x
  3. Step 3: Cross multiply
    290,919.99x = 436,379.78 × 91,255.80
  4. Step 4: Simplify right side
    290,919.99x = 39,822,185,927.72
  5. Step 5: Solve for x
    x = 39,822,185,927.72/290,919.99
  6. Step 6: Final answer
    x = 136,883.64

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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.