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Finding the Fourth Proportional to 519.18, 716.39 and 309.22

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Solution

The fourth proportional to 519.18, 716.39 and 309.22 is: 426.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    519.18 : 716.39 = 309.22 : x
  2. Step 2: Convert to fraction form
    519.18/716.39 = 309.22/x
  3. Step 3: Cross multiply
    519.18x = 716.39 × 309.22
  4. Step 4: Simplify right side
    519.18x = 221,521.68
  5. Step 5: Solve for x
    x = 221,521.68/519.18
  6. Step 6: Final answer
    x = 426.67

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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.