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Finding the Fourth Proportional to 290,874.10, 436,505.55 and 133,021.30

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Solution

The fourth proportional to 290,874.10, 436,505.55 and 133,021.30 is: 199,620.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    290,874.10 : 436,505.55 = 133,021.30 : x
  2. Step 2: Convert to fraction form
    290,874.10/436,505.55 = 133,021.30/x
  3. Step 3: Cross multiply
    290,874.10x = 436,505.55 × 133,021.30
  4. Step 4: Simplify right side
    290,874.10x = 58,064,535,718.22
  5. Step 5: Solve for x
    x = 58,064,535,718.22/290,874.10
  6. Step 6: Final answer
    x = 199,620.85

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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.