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Finding the Fourth Proportional to 520.22, 779.99 and 256.64

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Solution

The fourth proportional to 520.22, 779.99 and 256.64 is: 384.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    520.22 : 779.99 = 256.64 : x
  2. Step 2: Convert to fraction form
    520.22/779.99 = 256.64/x
  3. Step 3: Cross multiply
    520.22x = 779.99 × 256.64
  4. Step 4: Simplify right side
    520.22x = 200,175.35
  5. Step 5: Solve for x
    x = 200,175.35/520.22
  6. Step 6: Final answer
    x = 384.79

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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.