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Finding the Fourth Proportional to 847.20, 1,270.43 and 326.94

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Solution

The fourth proportional to 847.20, 1,270.43 and 326.94 is: 490.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    847.20 : 1,270.43 = 326.94 : x
  2. Step 2: Convert to fraction form
    847.20/1,270.43 = 326.94/x
  3. Step 3: Cross multiply
    847.20x = 1,270.43 × 326.94
  4. Step 4: Simplify right side
    847.20x = 415,354.38
  5. Step 5: Solve for x
    x = 415,354.38/847.20
  6. Step 6: Final answer
    x = 490.27

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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.