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Finding the Fourth Proportional to 517.22, 774.92 and 431.12

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Solution

The fourth proportional to 517.22, 774.92 and 431.12 is: 645.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    517.22 : 774.92 = 431.12 : x
  2. Step 2: Convert to fraction form
    517.22/774.92 = 431.12/x
  3. Step 3: Cross multiply
    517.22x = 774.92 × 431.12
  4. Step 4: Simplify right side
    517.22x = 334,083.51
  5. Step 5: Solve for x
    x = 334,083.51/517.22
  6. Step 6: Final answer
    x = 645.92

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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.