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Finding the Fourth Proportional to 516.88, 774.58 and 388.72

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Solution

The fourth proportional to 516.88, 774.58 and 388.72 is: 582.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    516.88 : 774.58 = 388.72 : x
  2. Step 2: Convert to fraction form
    516.88/774.58 = 388.72/x
  3. Step 3: Cross multiply
    516.88x = 774.58 × 388.72
  4. Step 4: Simplify right side
    516.88x = 301,094.74
  5. Step 5: Solve for x
    x = 301,094.74/516.88
  6. Step 6: Final answer
    x = 582.52

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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.