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Finding the Fourth Proportional to 517.09, 776.12 and 505.21

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Solution

The fourth proportional to 517.09, 776.12 and 505.21 is: 758.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    517.09 : 776.12 = 505.21 : x
  2. Step 2: Convert to fraction form
    517.09/776.12 = 505.21/x
  3. Step 3: Cross multiply
    517.09x = 776.12 × 505.21
  4. Step 4: Simplify right side
    517.09x = 392,101.06
  5. Step 5: Solve for x
    x = 392,101.06/517.09
  6. Step 6: Final answer
    x = 758.28

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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.