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Finding the Fourth Proportional to 517.28, 775.20 and 395.28

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Solution

The fourth proportional to 517.28, 775.20 and 395.28 is: 592.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    517.28 : 775.20 = 395.28 : x
  2. Step 2: Convert to fraction form
    517.28/775.20 = 395.28/x
  3. Step 3: Cross multiply
    517.28x = 775.20 × 395.28
  4. Step 4: Simplify right side
    517.28x = 306,421.06
  5. Step 5: Solve for x
    x = 306,421.06/517.28
  6. Step 6: Final answer
    x = 592.37

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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.