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Finding the Fourth Proportional to 516.72, 772.68 and 505.20

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Solution

The fourth proportional to 516.72, 772.68 and 505.20 is: 755.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    516.72 : 772.68 = 505.20 : x
  2. Step 2: Convert to fraction form
    516.72/772.68 = 505.20/x
  3. Step 3: Cross multiply
    516.72x = 772.68 × 505.20
  4. Step 4: Simplify right side
    516.72x = 390,357.94
  5. Step 5: Solve for x
    x = 390,357.94/516.72
  6. Step 6: Final answer
    x = 755.45

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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.