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Finding the Fourth Proportional to 518.66, 776.38 and 387.89

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Solution

The fourth proportional to 518.66, 776.38 and 387.89 is: 580.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.66 : 776.38 = 387.89 : x
  2. Step 2: Convert to fraction form
    518.66/776.38 = 387.89/x
  3. Step 3: Cross multiply
    518.66x = 776.38 × 387.89
  4. Step 4: Simplify right side
    518.66x = 301,148.10
  5. Step 5: Solve for x
    x = 301,148.10/518.66
  6. Step 6: Final answer
    x = 580.63

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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.