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Finding the Fourth Proportional to 518.36, 776.98 and 274.64

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Solution

The fourth proportional to 518.36, 776.98 and 274.64 is: 411.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.36 : 776.98 = 274.64 : x
  2. Step 2: Convert to fraction form
    518.36/776.98 = 274.64/x
  3. Step 3: Cross multiply
    518.36x = 776.98 × 274.64
  4. Step 4: Simplify right side
    518.36x = 213,389.79
  5. Step 5: Solve for x
    x = 213,389.79/518.36
  6. Step 6: Final answer
    x = 411.66

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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.