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Finding the Fourth Proportional to 343.05, 513.99 and 256.20

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Solution

The fourth proportional to 343.05, 513.99 and 256.20 is: 383.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    343.05 : 513.99 = 256.20 : x
  2. Step 2: Convert to fraction form
    343.05/513.99 = 256.20/x
  3. Step 3: Cross multiply
    343.05x = 513.99 × 256.20
  4. Step 4: Simplify right side
    343.05x = 131,684.24
  5. Step 5: Solve for x
    x = 131,684.24/343.05
  6. Step 6: Final answer
    x = 383.86

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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.