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Finding the Fourth Proportional to 518.26, 777.40 and 274.28

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Solution

The fourth proportional to 518.26, 777.40 and 274.28 is: 411.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.26 : 777.40 = 274.28 : x
  2. Step 2: Convert to fraction form
    518.26/777.40 = 274.28/x
  3. Step 3: Cross multiply
    518.26x = 777.40 × 274.28
  4. Step 4: Simplify right side
    518.26x = 213,225.27
  5. Step 5: Solve for x
    x = 213,225.27/518.26
  6. Step 6: Final answer
    x = 411.43

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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.