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Finding the Fourth Proportional to 517.11, 713.65 and 320.74

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Solution

The fourth proportional to 517.11, 713.65 and 320.74 is: 442.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    517.11 : 713.65 = 320.74 : x
  2. Step 2: Convert to fraction form
    517.11/713.65 = 320.74/x
  3. Step 3: Cross multiply
    517.11x = 713.65 × 320.74
  4. Step 4: Simplify right side
    517.11x = 228,896.10
  5. Step 5: Solve for x
    x = 228,896.10/517.11
  6. Step 6: Final answer
    x = 442.64

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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.