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Finding the Fourth Proportional to 519.81, 717.28 and 298.71

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Solution

The fourth proportional to 519.81, 717.28 and 298.71 is: 412.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    519.81 : 717.28 = 298.71 : x
  2. Step 2: Convert to fraction form
    519.81/717.28 = 298.71/x
  3. Step 3: Cross multiply
    519.81x = 717.28 × 298.71
  4. Step 4: Simplify right side
    519.81x = 214,258.71
  5. Step 5: Solve for x
    x = 214,258.71/519.81
  6. Step 6: Final answer
    x = 412.19

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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.