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Finding the Fourth Proportional to 518.18, 776.97 and 428.99

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Solution

The fourth proportional to 518.18, 776.97 and 428.99 is: 643.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.18 : 776.97 = 428.99 : x
  2. Step 2: Convert to fraction form
    518.18/776.97 = 428.99/x
  3. Step 3: Cross multiply
    518.18x = 776.97 × 428.99
  4. Step 4: Simplify right side
    518.18x = 333,308.48
  5. Step 5: Solve for x
    x = 333,308.48/518.18
  6. Step 6: Final answer
    x = 643.24

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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.