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Finding the Fourth Proportional to 617.80, 851.86 and 421.44

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Solution

The fourth proportional to 617.80, 851.86 and 421.44 is: 581.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    617.80 : 851.86 = 421.44 : x
  2. Step 2: Convert to fraction form
    617.80/851.86 = 421.44/x
  3. Step 3: Cross multiply
    617.80x = 851.86 × 421.44
  4. Step 4: Simplify right side
    617.80x = 359,007.88
  5. Step 5: Solve for x
    x = 359,007.88/617.80
  6. Step 6: Final answer
    x = 581.11

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.