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Finding the Fourth Proportional to 290,821.72, 436,220.22 and 91,137.70

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Solution

The fourth proportional to 290,821.72, 436,220.22 and 91,137.70 is: 136,702.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    290,821.72 : 436,220.22 = 91,137.70 : x
  2. Step 2: Convert to fraction form
    290,821.72/436,220.22 = 91,137.70/x
  3. Step 3: Cross multiply
    290,821.72x = 436,220.22 × 91,137.70
  4. Step 4: Simplify right side
    290,821.72x = 39,756,107,544.29
  5. Step 5: Solve for x
    x = 39,756,107,544.29/290,821.72
  6. Step 6: Final answer
    x = 136,702.68

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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.