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Finding the Fourth Proportional to 517.68, 714.66 and 393.36

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Solution

The fourth proportional to 517.68, 714.66 and 393.36 is: 543.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    517.68 : 714.66 = 393.36 : x
  2. Step 2: Convert to fraction form
    517.68/714.66 = 393.36/x
  3. Step 3: Cross multiply
    517.68x = 714.66 × 393.36
  4. Step 4: Simplify right side
    517.68x = 281,118.66
  5. Step 5: Solve for x
    x = 281,118.66/517.68
  6. Step 6: Final answer
    x = 543.04

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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.