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Finding the Fourth Proportional to 290,793.12, 436,189.02 and 91,128.72

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Solution

The fourth proportional to 290,793.12, 436,189.02 and 91,128.72 is: 136,692.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    290,793.12 : 436,189.02 = 91,128.72 : x
  2. Step 2: Convert to fraction form
    290,793.12/436,189.02 = 91,128.72/x
  3. Step 3: Cross multiply
    290,793.12x = 436,189.02 × 91,128.72
  4. Step 4: Simplify right side
    290,793.12x = 39,749,347,070.65
  5. Step 5: Solve for x
    x = 39,749,347,070.65/290,793.12
  6. Step 6: Final answer
    x = 136,692.87

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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.