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Finding the Fourth Proportional to 518.88, 778.24 and 432.76

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Solution

The fourth proportional to 518.88, 778.24 and 432.76 is: 649.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.88 : 778.24 = 432.76 : x
  2. Step 2: Convert to fraction form
    518.88/778.24 = 432.76/x
  3. Step 3: Cross multiply
    518.88x = 778.24 × 432.76
  4. Step 4: Simplify right side
    518.88x = 336,791.14
  5. Step 5: Solve for x
    x = 336,791.14/518.88
  6. Step 6: Final answer
    x = 649.07

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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.