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Finding the Fourth Proportional to 591.78, 817.29 and 405.75

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Solution

The fourth proportional to 591.78, 817.29 and 405.75 is: 560.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    591.78 : 817.29 = 405.75 : x
  2. Step 2: Convert to fraction form
    591.78/817.29 = 405.75/x
  3. Step 3: Cross multiply
    591.78x = 817.29 × 405.75
  4. Step 4: Simplify right side
    591.78x = 331,615.42
  5. Step 5: Solve for x
    x = 331,615.42/591.78
  6. Step 6: Final answer
    x = 560.37

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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.