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Finding the Fourth Proportional to 518.11, 776.68 and 209.91

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Solution

The fourth proportional to 518.11, 776.68 and 209.91 is: 314.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.11 : 776.68 = 209.91 : x
  2. Step 2: Convert to fraction form
    518.11/776.68 = 209.91/x
  3. Step 3: Cross multiply
    518.11x = 776.68 × 209.91
  4. Step 4: Simplify right side
    518.11x = 163,032.90
  5. Step 5: Solve for x
    x = 163,032.90/518.11
  6. Step 6: Final answer
    x = 314.67

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.