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Finding the Fourth Proportional to 290,783.81, 436,175.72 and 80,421.75

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Solution

The fourth proportional to 290,783.81, 436,175.72 and 80,421.75 is: 120,632.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    290,783.81 : 436,175.72 = 80,421.75 : x
  2. Step 2: Convert to fraction form
    290,783.81/436,175.72 = 80,421.75/x
  3. Step 3: Cross multiply
    290,783.81x = 436,175.72 × 80,421.75
  4. Step 4: Simplify right side
    290,783.81x = 35,078,014,609.38
  5. Step 5: Solve for x
    x = 35,078,014,609.38/290,783.81
  6. Step 6: Final answer
    x = 120,632.63

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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.