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Finding the Fourth Proportional to 518.94, 777.87 and 431.73

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Solution

The fourth proportional to 518.94, 777.87 and 431.73 is: 647.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.94 : 777.87 = 431.73 : x
  2. Step 2: Convert to fraction form
    518.94/777.87 = 431.73/x
  3. Step 3: Cross multiply
    518.94x = 777.87 × 431.73
  4. Step 4: Simplify right side
    518.94x = 335,829.82
  5. Step 5: Solve for x
    x = 335,829.82/518.94
  6. Step 6: Final answer
    x = 647.15

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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.