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Finding the Fourth Proportional to 518.90, 715.86 and 352.85

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Solution

The fourth proportional to 518.90, 715.86 and 352.85 is: 486.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.90 : 715.86 = 352.85 : x
  2. Step 2: Convert to fraction form
    518.90/715.86 = 352.85/x
  3. Step 3: Cross multiply
    518.90x = 715.86 × 352.85
  4. Step 4: Simplify right side
    518.90x = 252,587.62
  5. Step 5: Solve for x
    x = 252,587.62/518.90
  6. Step 6: Final answer
    x = 486.78

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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.