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Finding the Fourth Proportional to 517.55, 714.26 and 321.13

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Solution

The fourth proportional to 517.55, 714.26 and 321.13 is: 443.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    517.55 : 714.26 = 321.13 : x
  2. Step 2: Convert to fraction form
    517.55/714.26 = 321.13/x
  3. Step 3: Cross multiply
    517.55x = 714.26 × 321.13
  4. Step 4: Simplify right side
    517.55x = 229,365.14
  5. Step 5: Solve for x
    x = 229,365.14/517.55
  6. Step 6: Final answer
    x = 443.17

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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.