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Finding the Fourth Proportional to 516.86, 774.30 and 256.55

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Solution

The fourth proportional to 516.86, 774.30 and 256.55 is: 384.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    516.86 : 774.30 = 256.55 : x
  2. Step 2: Convert to fraction form
    516.86/774.30 = 256.55/x
  3. Step 3: Cross multiply
    516.86x = 774.30 × 256.55
  4. Step 4: Simplify right side
    516.86x = 198,642.79
  5. Step 5: Solve for x
    x = 198,642.79/516.86
  6. Step 6: Final answer
    x = 384.33

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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.