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Finding the Fourth Proportional to 517.58, 715.42 and 393.46

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Solution

The fourth proportional to 517.58, 715.42 and 393.46 is: 543.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    517.58 : 715.42 = 393.46 : x
  2. Step 2: Convert to fraction form
    517.58/715.42 = 393.46/x
  3. Step 3: Cross multiply
    517.58x = 715.42 × 393.46
  4. Step 4: Simplify right side
    517.58x = 281,489.15
  5. Step 5: Solve for x
    x = 281,489.15/517.58
  6. Step 6: Final answer
    x = 543.86

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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.