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Finding the Fourth Proportional to 290,814.42, 436,221.66 and 91,134.78

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Solution

The fourth proportional to 290,814.42, 436,221.66 and 91,134.78 is: 136,702.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    290,814.42 : 436,221.66 = 91,134.78 : x
  2. Step 2: Convert to fraction form
    290,814.42/436,221.66 = 91,134.78/x
  3. Step 3: Cross multiply
    290,814.42x = 436,221.66 × 91,134.78
  4. Step 4: Simplify right side
    290,814.42x = 39,754,965,015.33
  5. Step 5: Solve for x
    x = 39,754,965,015.33/290,814.42
  6. Step 6: Final answer
    x = 136,702.18

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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.