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Finding the Fourth Proportional to 617.29, 851.72 and 393.29

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Solution

The fourth proportional to 617.29, 851.72 and 393.29 is: 542.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    617.29 : 851.72 = 393.29 : x
  2. Step 2: Convert to fraction form
    617.29/851.72 = 393.29/x
  3. Step 3: Cross multiply
    617.29x = 851.72 × 393.29
  4. Step 4: Simplify right side
    617.29x = 334,972.96
  5. Step 5: Solve for x
    x = 334,972.96/617.29
  6. Step 6: Final answer
    x = 542.65

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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.