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Finding the Fourth Proportional to 518.90, 716.15 and 297.86

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Solution

The fourth proportional to 518.90, 716.15 and 297.86 is: 411.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.90 : 716.15 = 297.86 : x
  2. Step 2: Convert to fraction form
    518.90/716.15 = 297.86/x
  3. Step 3: Cross multiply
    518.90x = 716.15 × 297.86
  4. Step 4: Simplify right side
    518.90x = 213,312.44
  5. Step 5: Solve for x
    x = 213,312.44/518.90
  6. Step 6: Final answer
    x = 411.09

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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.