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Finding the Fourth Proportional to 517.50, 776.28 and 257.57

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Solution

The fourth proportional to 517.50, 776.28 and 257.57 is: 386.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    517.50 : 776.28 = 257.57 : x
  2. Step 2: Convert to fraction form
    517.50/776.28 = 257.57/x
  3. Step 3: Cross multiply
    517.50x = 776.28 × 257.57
  4. Step 4: Simplify right side
    517.50x = 199,942.56
  5. Step 5: Solve for x
    x = 199,942.56/517.50
  6. Step 6: Final answer
    x = 386.36

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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.