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Finding the Fourth Proportional to 523.80, 786.21 and 399.24

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Solution

The fourth proportional to 523.80, 786.21 and 399.24 is: 599.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    523.80 : 786.21 = 399.24 : x
  2. Step 2: Convert to fraction form
    523.80/786.21 = 399.24/x
  3. Step 3: Cross multiply
    523.80x = 786.21 × 399.24
  4. Step 4: Simplify right side
    523.80x = 313,886.48
  5. Step 5: Solve for x
    x = 313,886.48/523.80
  6. Step 6: Final answer
    x = 599.25

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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.