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Finding the Fourth Proportional to 290,835.65, 436,263.19 and 80,455.97

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Solution

The fourth proportional to 290,835.65, 436,263.19 and 80,455.97 is: 120,686.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    290,835.65 : 436,263.19 = 80,455.97 : x
  2. Step 2: Convert to fraction form
    290,835.65/436,263.19 = 80,455.97/x
  3. Step 3: Cross multiply
    290,835.65x = 436,263.19 × 80,455.97
  4. Step 4: Simplify right side
    290,835.65x = 35,099,975,543.15
  5. Step 5: Solve for x
    x = 35,099,975,543.15/290,835.65
  6. Step 6: Final answer
    x = 120,686.64

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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.