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Finding the Fourth Proportional to 518.15, 714.75 and 393.59

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Solution

The fourth proportional to 518.15, 714.75 and 393.59 is: 542.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.15 : 714.75 = 393.59 : x
  2. Step 2: Convert to fraction form
    518.15/714.75 = 393.59/x
  3. Step 3: Cross multiply
    518.15x = 714.75 × 393.59
  4. Step 4: Simplify right side
    518.15x = 281,318.45
  5. Step 5: Solve for x
    x = 281,318.45/518.15
  6. Step 6: Final answer
    x = 542.93

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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.