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Finding the Fourth Proportional to 518.12, 777.52 and 209.92

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Solution

The fourth proportional to 518.12, 777.52 and 209.92 is: 315.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.12 : 777.52 = 209.92 : x
  2. Step 2: Convert to fraction form
    518.12/777.52 = 209.92/x
  3. Step 3: Cross multiply
    518.12x = 777.52 × 209.92
  4. Step 4: Simplify right side
    518.12x = 163,217.00
  5. Step 5: Solve for x
    x = 163,217.00/518.12
  6. Step 6: Final answer
    x = 315.02

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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.