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Finding the Fourth Proportional to 290,895.88, 436,349.22 and 91,211.80

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Solution

The fourth proportional to 290,895.88, 436,349.22 and 91,211.80 is: 136,819.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    290,895.88 : 436,349.22 = 91,211.80 : x
  2. Step 2: Convert to fraction form
    290,895.88/436,349.22 = 91,211.80/x
  3. Step 3: Cross multiply
    290,895.88x = 436,349.22 × 91,211.80
  4. Step 4: Simplify right side
    290,895.88x = 39,800,197,784.80
  5. Step 5: Solve for x
    x = 39,800,197,784.80/290,895.88
  6. Step 6: Final answer
    x = 136,819.39

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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.