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Finding the Fourth Proportional to 518.35, 777.15 and 287.09

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Solution

The fourth proportional to 518.35, 777.15 and 287.09 is: 430.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.35 : 777.15 = 287.09 : x
  2. Step 2: Convert to fraction form
    518.35/777.15 = 287.09/x
  3. Step 3: Cross multiply
    518.35x = 777.15 × 287.09
  4. Step 4: Simplify right side
    518.35x = 223,113.94
  5. Step 5: Solve for x
    x = 223,113.94/518.35
  6. Step 6: Final answer
    x = 430.43

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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.