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Finding the Fourth Proportional to 514.97, 772.61 and 399.55

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Solution

The fourth proportional to 514.97, 772.61 and 399.55 is: 599.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    514.97 : 772.61 = 399.55 : x
  2. Step 2: Convert to fraction form
    514.97/772.61 = 399.55/x
  3. Step 3: Cross multiply
    514.97x = 772.61 × 399.55
  4. Step 4: Simplify right side
    514.97x = 308,696.33
  5. Step 5: Solve for x
    x = 308,696.33/514.97
  6. Step 6: Final answer
    x = 599.45

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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.