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Finding the Fourth Proportional to 518.13, 777.18 and 426.63

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Solution

The fourth proportional to 518.13, 777.18 and 426.63 is: 639.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.13 : 777.18 = 426.63 : x
  2. Step 2: Convert to fraction form
    518.13/777.18 = 426.63/x
  3. Step 3: Cross multiply
    518.13x = 777.18 × 426.63
  4. Step 4: Simplify right side
    518.13x = 331,568.30
  5. Step 5: Solve for x
    x = 331,568.30/518.13
  6. Step 6: Final answer
    x = 639.93

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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.