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Finding the Fourth Proportional to 517.21, 772.02 and 455.70

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Solution

The fourth proportional to 517.21, 772.02 and 455.70 is: 680.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    517.21 : 772.02 = 455.70 : x
  2. Step 2: Convert to fraction form
    517.21/772.02 = 455.70/x
  3. Step 3: Cross multiply
    517.21x = 772.02 × 455.70
  4. Step 4: Simplify right side
    517.21x = 351,806.62
  5. Step 5: Solve for x
    x = 351,806.62/517.21
  6. Step 6: Final answer
    x = 680.20

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.