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Finding the Fourth Proportional to 518.98, 716.20 and 309.27

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Solution

The fourth proportional to 518.98, 716.20 and 309.27 is: 426.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.98 : 716.20 = 309.27 : x
  2. Step 2: Convert to fraction form
    518.98/716.20 = 309.27/x
  3. Step 3: Cross multiply
    518.98x = 716.20 × 309.27
  4. Step 4: Simplify right side
    518.98x = 221,499.17
  5. Step 5: Solve for x
    x = 221,499.17/518.98
  6. Step 6: Final answer
    x = 426.80

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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.