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Finding the Fourth Proportional to 290,809.12, 436,213.02 and 91,144.72

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Solution

The fourth proportional to 290,809.12, 436,213.02 and 91,144.72 is: 136,716.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    290,809.12 : 436,213.02 = 91,144.72 : x
  2. Step 2: Convert to fraction form
    290,809.12/436,213.02 = 91,144.72/x
  3. Step 3: Cross multiply
    290,809.12x = 436,213.02 × 91,144.72
  4. Step 4: Simplify right side
    290,809.12x = 39,758,513,568.25
  5. Step 5: Solve for x
    x = 39,758,513,568.25/290,809.12
  6. Step 6: Final answer
    x = 136,716.87

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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.