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Finding the Fourth Proportional to 518.09, 776.45 and 209.58

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Solution

The fourth proportional to 518.09, 776.45 and 209.58 is: 314.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.09 : 776.45 = 209.58 : x
  2. Step 2: Convert to fraction form
    518.09/776.45 = 209.58/x
  3. Step 3: Cross multiply
    518.09x = 776.45 × 209.58
  4. Step 4: Simplify right side
    518.09x = 162,728.19
  5. Step 5: Solve for x
    x = 162,728.19/518.09
  6. Step 6: Final answer
    x = 314.09

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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.